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a straight line connecting the center of a circle with two points on its perimeter (or the center of a sphere with two points on its surface)
the length of a straight line passing through the center of a circle and connecting two points on the circumference (同)diam

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『直径』 / (レンズなどの)倍率

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出典(authority):フリー百科事典『ウィキペディア（Wikipedia）』「2016/10/04 23:03:31」(JST)

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Obstetric ultrasonography is the use of medical ultrasonography in pregnancy, in which sound waves are used to create real-time visual images of the developing embryo or fetus in its mother's uterus (womb). The procedure is a standard part of prenatal care in many countries, as it can provide a variety of information about the health of the mother, the timing and progress of the pregnancy, and the health and development of the embryo or fetus.

The International Society of Ultrasound in Obstetrics and Gynecology (ISUOG) recommends that pregnant women have routine obstetric ultrasounds between 18 weeks and 22 weeks gestational age in order to confirm pregnancy timing, to measure the fetus so that growth abnormalities can be recognized quickly later in pregnancy, and to assess for congenital malformations and multiple gestations (i.e. twins).^[1] Additionally, the ISUOG recommends that pregnant women have obstetric ultrasounds between 11 weeks and 13 weeks 6 days gestational age in countries with resources to perform them. Performing an ultrasound at this early stage of pregnancy can more accurately confirm the timing of the pregnancy and can also assess for multiple fetuses and major congenital abnormalities at an earlier stage.^[2] Research shows that routine obstetric ultrasound before 24 weeks gestational age can significantly reduce the risk of failing to recognize multiple gestations and can improve pregnancy dating to reduce the risk of labor induction for post-dates pregnancy. There is no difference, however, in perinatal death or poor outcomes for babies.^[3]

1 Terminology
2 Types
- 2.1 3D ultrasound
3 Medical uses
- 3.1 Early pregnancy
- 3.2 First trimester
- 3.3 Second and third trimester
- 3.4 Dating and growth monitoring
- 3.5 Fetal sex discernment
  - 3.5.1 Influencing factors
- 3.6 Ultrasonography of the cervix
- 3.7 Abnormality screening
4 Safety issues
5 History
6 Social and culture
7 See also
8 References
9 External links

Terminology

Below are useful terms on ultrasound:^[4]

Echogenic - giving rise to reflections (echoes) of ultrasound waves
Hyperechoic – more echogenic (brighter) than normal
Hypoechoic – less echogenic (darker) than normal
Isoechoic – the same echogenicity as another tissue
Transvaginal ultrasonography - Ultrasound is performed through the vagina
Transabdominal ultrasonography - Ultrasound is performed across the abdominal wall or through the abdominal cavity

In normal state, each body tissue type, such as liver, spleen or kidney, has a unique echogenicity. Fortunately, gestational sac, yolk sac and embryo are surrounded by hyperechoic (brighter) body tissues.

Types

Traditional obstetric sonograms are done by placing a transducer on the abdomen of the pregnant woman. One variant, a transvaginal sonography, is done with a probe placed in the woman's vagina. Transvaginal scans usually provide clearer pictures during early pregnancy and in obese women. Also used is Doppler sonography which detects the heartbeat of the fetus. Doppler sonography can be used to evaluate the pulsations in the fetal heart and bloods vessels for signs of abnormalities.^[5]

3D ultrasound

Modern 3D ultrasound images provide greater detail for prenatal diagnosis than the older 2D ultrasound technology.^[6] While 3D is popular with parents desiring a prenatal photograph as a keepsake,^[7] both 2D and 3D are discouraged by the FDA for non-medical use,^[8] but there are no definitive studies linking ultrasound to any adverse medical effects.^[9] The following 3D ultrasound images were taken at different stages of pregnancy:

Play media

3D Ultrasound of fetal movements at 12 weeks
75-mm fetus (about 14 weeks gestational age)
Fetus at 17 weeks
Fetus at 20 weeks

Medical uses

Early pregnancy

A gestational sac can be reliably seen on transvaginal ultrasound by 5 weeks gestational age (approximately 3 weeks after ovulation).The embryo should be seen by the time the gestational sac measures 20mm, about five and a half weeks. The heartbeat is usually seen on transvaginal ultrasound by the time the embryo measures 5mm, but may not be visible until the embryo reaches 7mm, around 7 weeks gestational age.^[5]^[10]^[11] Coincidentally, most miscarriages also happen by 7 weeks gestation. The rate of miscarriage, especially threatened miscarriage, drops significantly if normal heartbeat is detected.^[12]

Contents in the cavity of the uterus seen at approximately 5 weeks of gestational age.
Artificially colored, showing gestational sac, yolk sac and embryo (measuring 3 mm as the distance between the + signs).
Embryo at 5 weeks and 1 day of gestational age (at top left) with discernible heartbeat.
Embryo at 5 weeks and 5 days of gestational age with discernible heartbeat.

First trimester

In the first trimester, a standard ultrasound examination typically includes:^[11]

Gestational sac size, location, and number
Identification of the embryo and/or yolk sac
Measurement of fetal length (known as the crown-rump length)
Fetal number, including number of amnionic sacs and chorionic sacs for multiple gestations
Embryonic/fetal cardiac activity
Assessment of embryonic/fetal anatomy appropriate for the first trimester
Evaluation of the maternal uterus, tubes, ovaries, and surrounding structures
Evaluation of the fetal nuchal fold, with consideration of fetal nuchal translucency assessment

Second and third trimester

In the second trimester, a standard ultrasound exam typically includes:^[11]

Fetal number, including number of amnionic sacs and chorionic sacs for multiple gestations
Fetal cardiac activity
Fetal position relative to the uterus and cervix
Location and appearance of the placenta, including site of umbilical cord insertion when possible
Amnionic fluid volume
Gestational age assessment
Fetal weight estimation
Fetal anatomical survey
Evaluation of the maternal uterus, tubes, ovaries, and surrounding structures when appropriate

Dating and growth monitoring

Biparietal diameter is taken as the maximal transverse diameter of in a visualization of the horizontal plane of the head.

Biparietal diameter (the transverse diameter of the head) by gestational age, with the blue line representing the mean and the green area representing the 90% prediction interval.^[13]

Gestational age is usually determined by the date of the woman's last menstrual period, and assuming ovulation occurred on day fourteen of the menstrual cycle. Sometimes a woman may be uncertain of the date of her last menstrual period, or there may be reason to suspect ovulation occurred significantly earlier or later than the fourteenth day of her cycle. Ultrasound scans offer an alternative method of estimating gestational age. The most accurate measurement for dating is the crown-rump length of the fetus, which can be done between 7 and 13 weeks of gestation. After 13 weeks of gestation, the fetal age may be estimated using the biparietal diameter (the transverse diameter of the head), the head circumference, the length of the femur, the crown-heel length (head to heel), and other fetal parameters.^[14] Dating is more accurate when done earlier in the pregnancy; if a later scan gives a different estimate of gestational age, the estimated age is not normally changed but rather it is assumed the fetus is not growing at the expected rate.^[5]

Not useful for dating, the abdominal circumference of the fetus may also be measured. This gives an estimate of the weight and size of the fetus and is important when doing serial ultrasounds to monitor fetal growth.^[5]

Fetal sex discernment

Sonogram of male fetus, with scrotum and penis in center of image

The sex of the fetus may be discerned by ultrasound as early as 11 weeks gestation. The accuracy is relatively imprecise when attempted early.^[15]^[16]^[17] After 13 weeks gestation, a high accuracy of between 99% to 100% is possible if the fetus does not display intersex external characteristics.^[18]

The following is accuracy data from two hospitals:

Gestational Age	King's College Hospital Medical School^[16]	Taipei City Hospital & Li Shin Hospital^[17]
11 weeks	70.3%	71.9%
12 weeks	98.7%	92%
13 weeks	100%	98.3%

Influencing factors

The accuracy of fetal sex discernment depends on:^[15]

Gestational age
Precision of sonographic machine
Expertise of the operator
Fetal posture

Ultrasonography of the cervix

Fetus at 14 weeks (profile)

Obstetric sonography has become useful in the assessment of the cervix in women at risk for premature birth. A short cervix preterm is undesirable: At 24 weeks gestation a cervix length of less than 25 mm defines a risk group for preterm birth, further, the shorter the cervix the greater the risk.^[19] It also has been helpful to use ultrasonography in women with preterm contractions, as those whose cervix length exceed 30 mm are unlikely to deliver within the next week.^[20]

Abnormality screening

In some countries, routine pregnancy sonographic scans are performed to detect developmental defects before birth. This includes checking the status of the limbs and vital organs, as well as (sometimes) specific tests for abnormalities. Some abnormalities detected by ultrasound can be addressed by medical treatment in utero or by perinatal care, though indications of other abnormalities can lead to a decision regarding abortion.

Perhaps the most common such test uses a measurement of the nuchal translucency thickness ("NT-test", or "Nuchal Scan"). Although 91% of fetuses affected by Down syndrome exhibit this defect, 5% of fetuses flagged by the test do not have Down syndrome.

Ultrasound may also detect fetal organ anomaly. Usually scans for this type of detection are done around 18 to 23 weeks of gestational age. Some resources indicate that there are clear reasons for this and that such scans are also clearly beneficial because ultrasound enables clear clinical advantages for assessing the developing fetus in terms of morphology, bone shape, skeletal features, fetal heart function, volume evaluation, fetal lung maturity,^[21] and general fetus well being.^[22]

Safety issues

Play media

3D rendering of the fetal spine in a scan at 19 weeks of pregnancy

Current evidence indicates that diagnostic ultrasound is safe for the unborn child, unlike radiographs, which employ ionizing radiation. Randomized controlled trials have followed children up to ages 8–9, with no significant differences in vision, hearing, school performance, dyslexia, or speech and neurologic development by exposure to ultrasound.^[23] In one randomized trial, the children with greater exposure to ultrasound had a reduction in perinatal mortality, and was attributed to the increased detection of anomalies in the ultrasound group.^[23]

The 1985 maximum power allowed by the U.S. Food and Drug Administration (FDA) of 180 milliwatts per square cm ^[24] is well under the levels used in therapeutic ultrasound, but still higher than the 30-80 milliwatts per square cm range of the Statison V veterinary LIPUS device.^[25]

Doppler ultrasonography examinations has a thermal index (TI) of about five times that of regular (B-mode) ultrasound examinations.^[23] Several randomized controlled trials have reported no association between Doppler exposure and birth weight, Apgar scores, and perinatal mortality. One randomized controlled trial, however, came to the result of a higher perinatal death rate of normally formed infants born after 24 weeks exposed to Doppler ultrasonography (RR 3.95, 95% CI 1.32–11.77), but this was not a primary outcome of the study, and has been speculated to be due to chance rather than a harmful effect of Doppler itself.^[23]

The FDA discourages its use for non-medical purposes such as fetal keepsake videos and photos, even though it is the same technology used in hospitals.^[26]

History

Scottish physician Ian Donald was one of the pioneers of medical use of ultrasound. His article "Investigation of Abdominal Masses by Pulsed Ultrasound" was published in The Lancet in 1958.^[27] Donald was Regius Professor of Midwifery at the University of Glasgow.^[28]

In 1962, after about two years of work, Joseph Holmes, William Wright, and Ralph Meyerdirk developed the first compound contact B-mode scanner. Their work had been supported by U.S. Public Health Services and the University of Colorado. Wright and Meyerdirk left the university to form Physionic Engineering Inc., which launched the first commercial hand-held articulated arm compound contact B-mode scanner in 1963.^[29] This was the start of the most popular design in the history of ultrasound scanners.

Obstetric ultrasound has played a significant role in the development of diagnostic ultrasound technology in general. Much of the technological advances in diagnostic ultrasound technology are due to the drive to create better obstetric ultrasound equipment. Acuson Corporation's pioneering work on the development of Coherent Image Formation helped shape the development of diagnostic ultrasound equipment as a whole.^{[citation needed]}

In March and April 2015, a post by a pregnant woman named Jen Martin (née Cardinal) and her husband to YouTube, which had been viewed at least 2 million times and had many likes, showed the 14-week-old fetus clapping repeatedly to the song, sung by the parents, "If You're Happy And You Know It." It was later revealed that the video- while not a fake- had been somewhat edited to show more fetal claps than likely occurred. It is not unprecedented for fetuses of that age to make momentary movements that could be repeated once or twice beyond the initial movement, according to experts, but to repeat such a movement more than that- especially purposefully- would not likely be feasible at that point.^[30]^[31]^[32]

Social and culture

The increasingly widespread use of ultrasound technology in monitoring pregnancy has had a great impact on the way in which women and societies at large conceptualise and experience pregnancy and childbirth.^[33] The pervasive spread of obstetric ultrasound technology around the world and the conflation of its use with creating a ‘safe’ pregnancy as well as the ability to see and determine features like the sex of the fetus affect the way in which pregnancy is experienced and conceptualised.^[33] This “technocratic takeover” ^[33] of pregnancy is not limited to western or developed nations but also affects conceptualisations and experiences in developing nations and is an example of the increasing medicalisation of pregnancy, a phenomenon that has social as well as technological ramifications.^[33] Ethnographic research concerned with the use of ultrasound technology in monitoring pregnancy can show us how it has changed the embodied experience of expecting mothers around the globe.^[33]

References

^ Salomon, LJ; Alfirevic, Z; Berghella, V; Bilardo, C; Hernandez-Andrade, E; Johnsen, SL; Kalache, K; Leung, K.-Y.; Malinger, G; Munoz, H; Prefumo, F; Toi, A; Lee, W (2010). "Practice guidelines for performance of the routine mid-trimester fetal ultrasound scan" (PDF). Ultrasound Obstet Gynecol. 37: 116–126. doi:10.1002/uog.8831. Retrieved 12 May 2015.
^ Salomon, LJ; Alfirevic, Z; Bilardo, CM; Chalouhi, GE; Ghi, T; Kagan, KO; Lau, TK; Papageorghiou, AT; Raine-Fenning, NJ; Stirnemann, J; Suresh, S; Tabor, A; Timor-Tritsch, IE; Toi, A; Yeo, G (2013). "ISUOG Practice Guidelines: performance of first-trimester fetal ultrasound scan" (PDF). Ultrasound Obstet Gynecol. 41: 102–113. doi:10.1002/uog.12342. Retrieved 12 May 2015.
^ Whitworth, M; Bricker, L; Neilson, JP; Dowswell, T (2010). "Ultrasound for fetal assessment in early pregnancy". Cochrane Database of Systematic Reviews (4): CD007058. doi:10.1002/14651858.CD007058.pub2. PMID 20393955.
^ Zwingenberger, Allison (10 April 2007). "What do hyperechoic and hypoechoic mean?". DVM Journals.
^ ^a ^b ^c ^d Woo, Joseph (2006). "Why and when is Ultrasound used in Pregnancy?". Obstetric Ultrasound: A Comprehensive Guide. Retrieved 2007-05-27.
^ Dimitrova V, Markov D, Dimitrov R (2007). "[3D and 4D ultrasonography in obstetrics]". Akush Ginekol (Sofiia) (in Bulgarian). 46 (2): 31–40. PMID 17469450.
^ Sheiner E, Hackmon R, Shoham-Vardi I, et al. (2007). "A comparison between acoustic output indices in 2D and 3D/4D ultrasound in obstetrics". Ultrasound Obstet Gynecol. 29 (3): 326–8. doi:10.1002/uog.3933. PMID 17265534.
^ Rados C (January–February 2004). "FDA Cautions Against Ultrasound 'Keepsake' Images". FDA Consumer Magazine. Archived from the original on 13 May 2009. Retrieved 28 February 2012.
^ Kempley R (9 August 2003). "The Grin Before They Bear It; Peek-a-Boo: Prenatal Portraits for the Ultrasound Set". Washington Post.
^ Boschert, Sherry (2001-06-15). "Anxious Patients Often Want Very Early Ultrasound Exam". OB/GYN News. FindArticles.com. Retrieved 2007-05-27.
^ ^a ^b ^c Cunningham, F; Leveno, KJ; Bloom, SL; Spong, CY; Dashe, JS; Hoffman, BL; Casey BM, BM; Sheffield, JS (2013). "Fetal Imaging". Williams Obstetrics, Twenty-Fourth Edition. McGraw-Hill. |access-date= requires |url= (help)
^ "Miscarriage". A.D.A.M., Inc. 21 Nov 2010. Retrieved 28 February 2012.
^ Snijders, RJ.; Nicolaides, KH. (Jan 1994). "Fetal biometry at 14-40 weeks' gestation.". Ultrasound Obstet Gynecol. 4 (1): 34–48. doi:10.1046/j.1469-0705.1994.04010034.x. PMID 12797224.
^ "Pregnancy Week by Week". OPregnancy.com. 2009. Retrieved 17 March 2012.
^ ^a ^b Merz, Eberhard (2005). Ultrasound in obstetrics and gynecology (2nd ed.). Stuttgart: Thieme. p. 129. ISBN 1-58890-147-5.
^ ^a ^b Efrat, Z.; Akinfenwa, O. O.; Nicolaides, K. H. (1999). "First-trimester determination of fetal gender by ultrasound". Ultrasound in Obstetrics and Gynecology. 13 (5): 305–7. doi:10.1046/j.1469-0705.1999.13050305.x. PMID 10380292.
^ ^a ^b Hsiao, C.H.; Wang, H.C.; Hsieh, C.F.; Hsu, J.J. (2008). "Fetal gender screening by ultrasound at 11 to 13⁺⁶ weeks". Acta Obstetricia et Gynecologica Scandinavica. 87 (1): 8–13. doi:10.1080/00016340701571905. PMID 17851807.
^ Odeh, Marwan; Grinin, Vitali; Kais, Mohamad; Ophir, Ella; Bornstein, Jacob (2009). "Sonographic Fetal Sex Determination". Obstetrical & Gynecological Survey. 64: 50–57. doi:10.1097/OGX.0b013e318193299b.
^ Iams, Jay D.; Goldenberg, Robert L.; Meis, Paul J.; Mercer, Brian M.; Moawad, Atef; Das, Anita; Thom, Elizabeth; McNellis, Donald; et al. (1996). "The Length of the Cervix and the Risk of spontaneous Premature Delivery". New England Journal of Medicine. 334 (9): 567–72. doi:10.1056/NEJM199602293340904. PMID 8569824.
^ Leitich, Harald; Brunbauer, Mathias; Kaider, Alexandra; Egarter, Christian; Husslein, Peter (1999). "Cervical length and dilatation of the internal cervical os detected by vaginal ultrasonography as markers for preterm delivery: A systematic review". American Journal of Obstetrics and Gynecology. 181 (6): 1465–72. doi:10.1016/S0002-9378(99)70407-2. PMID 10601930.
^ Bhanu Prakash, K.N.; Ramakrishnan, A.G.; Suresh, S.; Chow, T.W.P. (March 2002). "Fetal lung maturity analysis using ultrasound image features" (PDF). Information Technology in Biomedicine, IEEE Transactions on. 6 (1): 38–45. doi:10.1109/4233.992160. Retrieved 7 December 2014.
^ http://www.layyous.com/ultasound/clinicaladvantages.htm
^ ^a ^b ^c ^d Houston, Laura E.; Odibo, Anthony O.; Macones, George A. (2009). "The safety of obstetrical ultrasound: a review". Prenatal Diagnosis. 29 (13): 1204–1212. doi:10.1002/pd.2392. ISSN 0197-3851.
^ Freitas, Robert A. (1999). Nanomedicine. Austin, TX: Landes Bioscience. ISBN 978-1-57059-645-2. ^{[page needed]}
^ "Statison V Operations Manual" (PDF). Statison Medical, Inc. 1997. Archived from the original (PDF) on 27 May 2008.
^ "Fetal Keepsake Videos". Food and Drug Administration. Retrieved 2011-05-21.
^ Donald, I; MacVicar, J; Brown, TG (1958). "Investigation of abdominal masses by pulsed ultrasound". Lancet. 1 (7032): 1188–95. doi:10.1016/S0140-6736(58)91905-6. PMID 13550965.
^ Ian Donald's paper in the Lancet in 1958 by Joseph Woo^{[self-published source?]}
^ Woo, Joseph (2002). "A short History of the development of Ultrasound in Obstetrics and Gynecology". ob-ultrasound.net. Retrieved 2007-08-26. ^{[self-published source?]}
^ "Ultrasound Appears To Show Fetus Clapping To 'If You're Happy And You Know It'". Huffington Post. 30 March 2015.
^ http://www.inquisitr.com/1963365/ultrasound-shows-baby-clapping-to-if-youre-happy-and-you-know-it/
^ http://au.ibtimes.com/viral-ultrasound-video-clapping-fetus-not-fake-mom-insists-1435475
^ ^a ^b ^c ^d ^e [Gammeltoft, Tine, 2007, Sonography and Sociality – Obstetrical Ultrasound Imagining in Urban Vietnam, Medical Anthropology Quarterly, 21:2, 133-153]

External links

RadiologyInfo: Obstetric Ultrasound Imaging
AIUM statement on prudent use of Ultrasound
The Global Library of Women's Medicine Imaging in Obstetrics and Gynecology link

UpToDate Contents

全文を閲覧するには購読必要です。 To read the full text you will need to subscribe.

1. 妊娠期間および出産予定日の出生前評価 prenatal assessment of gestational age and estimated date of delivery
2. 胎児発育遅延：診断 fetal growth restriction diagnosis
3. 在胎月齢の生後評価 postnatal assessment of gestational age
4. 胎児体重の出生前超音波評価 prenatal sonographic assessment of fetal weight
5. 胎児性巨大児 fetal macrosomia

English Journal

Clinical characteristics of mirror syndrome: a comparison of 10 cases of mirror syndrome with non-mirror syndrome fetal hydrops cases.

Hirata G1, Aoki S2, Sakamaki K3, Takahashi T2, Hirahara F4, Ishikawa H1.
The journal of maternal-fetal & neonatal medicine : the official journal of the European Association of Perinatal Medicine, the Federation of Asia and Oceania Perinatal Societies, the International Society of Perinatal Obstetricians.J Matern Fetal Neonatal Med.2016 Aug;29(16):2630-4. doi: 10.3109/14767058.2015.1095880. Epub 2015 Oct 20.
OBJECTIVE: To investigate clinical features of mirror syndrome.METHODS: We retrospectively reviewed 71 cases of fetal hydrops with or without mirror syndrome, and compared with respect to maternal age, the body mass index, the primipara rate, the gestational age at delivery, the timing of fetal hydr
PMID 26482778

Early fetal growth in progesterone-treated IVF pregnancies.

Spiliopoulos D1, Economides DL2.
Archives of gynecology and obstetrics.Arch Gynecol Obstet.2016 Jul;294(1):63-9. doi: 10.1007/s00404-015-3951-3. Epub 2015 Nov 13.
PURPOSE: The aim of this study was to compare fetal growth in the first and second trimesters of pregnancy and final birth weights between two groups of women: (a) spontaneous conceptions with reliable menstrual dates and (b) IVF pregnancies on progesterone supplementation during the first trimester
PMID 26563314

The feasibility of using 5D CNS software in obtaining standard fetal head measurements from volumes acquired by three-dimensional ultrasonography: comparison with two-dimensional ultrasound.

Rizzo G1, Aiello E1, Elena Pietrolucci M1, Arduini D1.
The journal of maternal-fetal & neonatal medicine : the official journal of the European Association of Perinatal Medicine, the Federation of Asia and Oceania Perinatal Societies, the International Society of Perinatal Obstetricians.J Matern Fetal Neonatal Med.2016 Jul;29(14):2217-22. doi: 10.3109/14767058.2015.1081891. Epub 2015 Sep 11.
OBJECTIVE: To evaluate the performance of a new software (5D CNS) developed to automatically recognize the axial planes of the fetal brain from three-dimensional volumes and to obtain the basic standard biometric measurements. The accuracy, reproducibility, and time required for analysis of 5D CNS w
PMID 26364724

Japanese Journal

Fetal growth restriction in rural Bangladesh: a prospective study

Tropical medicine and health 46, 3, 2018-02
NAID 120006463929

Small head size and delayed body weight growth in wild Japanese monkey fetuses after the Fukushima Daiichi nuclear disaster

Scientific Reports 7, 2017-06-14
NAID 120006355751

Morphological features and length measurements of fetal lateral ventricles at 16-25 weeks of gestation by magnetic resonance imaging

Congenital Anomalies 55(2), 99-102, 2015-05
NAID 120005844264

Related Pictures

★リンクテーブル★

リンク元	「児頭大横径」「BPD」

「児頭大横径」

Obstetric Ultrasonography
	Intervention
	Obstetric sonogram of a fetus at 16 weeks. The bright white circle center-right is the head, which faces to the left. Features include the forehead at 10 o'clock, the left ear toward the center at 7 o'clock and the right hand covering the eyes at 9:00.
ICD-9-CM	88.78
MeSH	D016216
OPS-301 code	3-032, 3-05d
	[edit on Wikidata]

　　[★]

英: biparietal diameter, BPD
同: 大横径、胎児児頭大横径
関: 妊娠週数、妊娠期別検査; GS->CRL->BPD

NGY.113(発育速度), 336(定義)

第12-15週で妊娠週数の評価に用いられる。

児頭大横径 = 妊娠週数 / 4 (cm)

妊娠末期には9cmとなる。

「BPD」

　　[★]

[1] Salomon, LJ; Alfirevic, Z; Berghella, V; Bilardo, C; Hernandez-Andrade, E; Johnsen, SL; Kalache, K; Leung, K.-Y.; Malinger, G; Munoz, H; Prefumo, F; Toi, A; Lee, W (2010). "Practice guidelines for performance of the routine mid-trimester fetal ultrasound scan" (PDF). Ultrasound Obstet Gynecol. 37: 116–126. doi:10.1002/uog.8831. Retrieved 12 May 2015.

[2] Salomon, LJ; Alfirevic, Z; Bilardo, CM; Chalouhi, GE; Ghi, T; Kagan, KO; Lau, TK; Papageorghiou, AT; Raine-Fenning, NJ; Stirnemann, J; Suresh, S; Tabor, A; Timor-Tritsch, IE; Toi, A; Yeo, G (2013). "ISUOG Practice Guidelines: performance of first-trimester fetal ultrasound scan" (PDF). Ultrasound Obstet Gynecol. 41: 102–113. doi:10.1002/uog.12342. Retrieved 12 May 2015.

[3] Whitworth, M; Bricker, L; Neilson, JP; Dowswell, T (2010). "Ultrasound for fetal assessment in early pregnancy". Cochrane Database of Systematic Reviews (4): CD007058. doi:10.1002/14651858.CD007058.pub2. PMID 20393955.

[Ultrasound_Terms-4] Zwingenberger, Allison (10 April 2007). "What do hyperechoic and hypoechoic mean?". DVM Journals.

[woo-5] Woo, Joseph (2006). "Why and when is Ultrasound used in Pregnancy?". Obstetric Ultrasound: A Comprehensive Guide. Retrieved 2007-05-27.

[pmid17469450-6] Dimitrova V, Markov D, Dimitrov R (2007). "[3D and 4D ultrasonography in obstetrics]". Akush Ginekol (Sofiia) (in Bulgarian). 46 (2): 31–40. PMID 17469450.

[pmid17265534-7] Sheiner E, Hackmon R, Shoham-Vardi I, et al. (2007). "A comparison between acoustic output indices in 2D and 3D/4D ultrasound in obstetrics". Ultrasound Obstet Gynecol. 29 (3): 326–8. doi:10.1002/uog.3933. PMID 17265534.

[8] Rados C (January–February 2004). "FDA Cautions Against Ultrasound 'Keepsake' Images". FDA Consumer Magazine. Archived from the original on 13 May 2009. Retrieved 28 February 2012.

[9] Kempley R (9 August 2003). "The Grin Before They Bear It; Peek-a-Boo: Prenatal Portraits for the Ultrasound Set". Washington Post.

[boschert-10] Boschert, Sherry (2001-06-15). "Anxious Patients Often Want Very Early Ultrasound Exam". OB/GYN News. FindArticles.com. Retrieved 2007-05-27.

[McGraw-Hill-11] Cunningham, F; Leveno, KJ; Bloom, SL; Spong, CY; Dashe, JS; Hoffman, BL; Casey BM, BM; Sheffield, JS (2013). "Fetal Imaging". Williams Obstetrics, Twenty-Fourth Edition. McGraw-Hill. |access-date= requires |url= (help)

[12] "Miscarriage". A.D.A.M., Inc. 21 Nov 2010. Retrieved 28 February 2012.

[13] Snijders, RJ.; Nicolaides, KH. (Jan 1994). "Fetal biometry at 14-40 weeks' gestation.". Ultrasound Obstet Gynecol. 4 (1): 34–48. doi:10.1046/j.1469-0705.1994.04010034.x. PMID 12797224.

[14] "Pregnancy Week by Week". OPregnancy.com. 2009. Retrieved 17 March 2012.

[isbn_1588901475-15] Merz, Eberhard (2005). Ultrasound in obstetrics and gynecology (2nd ed.). Stuttgart: Thieme. p. 129. ISBN 1-58890-147-5.

[pmid_10380292-16] Efrat, Z.; Akinfenwa, O. O.; Nicolaides, K. H. (1999). "First-trimester determination of fetal gender by ultrasound". Ultrasound in Obstetrics and Gynecology. 13 (5): 305–7. doi:10.1046/j.1469-0705.1999.13050305.x. PMID 10380292.

[pmid_17851807-17] Hsiao, C.H.; Wang, H.C.; Hsieh, C.F.; Hsu, J.J. (2008). "Fetal gender screening by ultrasound at 11 to 13⁺⁶ weeks". Acta Obstetricia et Gynecologica Scandinavica. 87 (1): 8–13. doi:10.1080/00016340701571905. PMID 17851807.

[pmid_19099612-18] Odeh, Marwan; Grinin, Vitali; Kais, Mohamad; Ophir, Ella; Bornstein, Jacob (2009). "Sonographic Fetal Sex Determination". Obstetrical & Gynecological Survey. 64: 50–57. doi:10.1097/OGX.0b013e318193299b.

[19] Iams, Jay D.; Goldenberg, Robert L.; Meis, Paul J.; Mercer, Brian M.; Moawad, Atef; Das, Anita; Thom, Elizabeth; McNellis, Donald; et al. (1996). "The Length of the Cervix and the Risk of spontaneous Premature Delivery". New England Journal of Medicine. 334 (9): 567–72. doi:10.1056/NEJM199602293340904. PMID 8569824.

[20] Leitich, Harald; Brunbauer, Mathias; Kaider, Alexandra; Egarter, Christian; Husslein, Peter (1999). "Cervical length and dilatation of the internal cervical os detected by vaginal ultrasonography as markers for preterm delivery: A systematic review". American Journal of Obstetrics and Gynecology. 181 (6): 1465–72. doi:10.1016/S0002-9378(99)70407-2. PMID 10601930.

[21] Bhanu Prakash, K.N.; Ramakrishnan, A.G.; Suresh, S.; Chow, T.W.P. (March 2002). "Fetal lung maturity analysis using ultrasound image features" (PDF). Information Technology in Biomedicine, IEEE Transactions on. 6 (1): 38–45. doi:10.1109/4233.992160. Retrieved 7 December 2014.

[22] ttp://www.layyous.com/ultasound/clinicaladvantages.htm

[HoustonOdibo2009-23] Houston, Laura E.; Odibo, Anthony O.; Macones, George A. (2009). "The safety of obstetrical ultrasound: a review". Prenatal Diagnosis. 29 (13): 1204–1212. doi:10.1002/pd.2392. ISSN 0197-3851.

[24] Freitas, Robert A. (1999). Nanomedicine. Austin, TX: Landes Bioscience. ISBN 978-1-57059-645-2. ^{[page needed]}

[25] "Statison V Operations Manual" (PDF). Statison Medical, Inc. 1997. Archived from the original (PDF) on 27 May 2008.

[26] "Fetal Keepsake Videos". Food and Drug Administration. Retrieved 2011-05-21.

[27] Donald, I; MacVicar, J; Brown, TG (1958). "Investigation of abdominal masses by pulsed ultrasound". Lancet. 1 (7032): 1188–95. doi:10.1016/S0140-6736(58)91905-6. PMID 13550965.

[28] Ian Donald's paper in the Lancet in 1958 by Joseph Woo^{[self-published source?]}

[29] Woo, Joseph (2002). "A short History of the development of Ultrasound in Obstetrics and Gynecology". ob-ultrasound.net. Retrieved 2007-08-26. ^{[self-published source?]}

[30] "Ultrasound Appears To Show Fetus Clapping To 'If You're Happy And You Know It'". Huffington Post. 30 March 2015.

[31] ttp://www.inquisitr.com/1963365/ultrasound-shows-baby-clapping-to-if-youre-happy-and-you-know-it/

[32] ttp://au.ibtimes.com/viral-ultrasound-video-clapping-fetus-not-fake-mom-insists-1435475

[Gammeltoft.2C_Tine_2007-33] [Gammeltoft, Tine, 2007, Sonography and Sociality – Obstetrical Ultrasound Imagining in Urban Vietnam, Medical Anthropology Quarterly, 21:2, 133-153]

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biparietal diameter