Bromley Bryann, Shipp Thomas D, Benacerraf Beryl
Department of Radiology and Obstetrics & Gynecology, Brigham & Women's Hospital, Harvard Medical School, Boston, MA, USA.
J Clin Ultrasound. 2007 Jun;35(5):231-7. doi: 10.1002/jcu.20379.
To examine whether the third-trimester fetus can be assessed sonographically using 3-dimensional (3D) volume data sets.
Twenty-seven consecutive third-trimester fetuses were evaluated. Fetuses were scanned using 2-dimensional (2D) imaging followed by 5 3D volume acquisitions. The initial scan was interpreted and reported based on the 2D images. The 3D volume data sets were independently reviewed offline several weeks later by 2 sonologists. Parameters evaluated included fetal presentation, placental location, amniotic fluid volume, fetal biometry including a calculation of estimated fetal weight, and major fetal anatomic structures. The result of the interpretation via 3D reconstruction of the volume from each of the 2 sonologists was compared with the original 2D sonography report.
Fetal presentation, amniotic fluid volume, and placental location with respect to the cervix were correctly identified 100% of the time by each sonologist. The estimated fetal weight was within 10% of the 2D estimate 89% (95% CI, 0.71-0.98) of the time for sonologist A and 96% (95% CI, 0.81-0.99) of the time for sonologist B. The majority of major anatomic landmarks were adequately seen by both sonologists.
Offline review of 3D volume data sets is a reliable method for determining fetal presentation, amniotic fluid volume, placental location, and estimating fetal weight in the third trimester.
探讨能否利用三维（3D）容积数据集对孕晚期胎儿进行超声评估。
对27例连续的孕晚期胎儿进行评估。先采用二维（2D）成像对胎儿进行扫描，随后采集5个三维容积数据。初始扫描根据二维图像进行解读并报告。几周后，两名超声科医生对三维容积数据集进行独立的离线复查。评估的参数包括胎儿先露、胎盘位置、羊水量、胎儿生物测量（包括估计胎儿体重的计算）以及主要胎儿解剖结构。将两名超声科医生通过对容积进行三维重建得出的解读结果与原始二维超声报告进行比较。
每位超声科医生对胎儿先露、羊水量以及胎盘相对于宫颈的位置的识别准确率均为100%。超声科医生A对胎儿体重的估计在二维估计值的10%以内的时间占89%（95%可信区间，0.71 - 0.98），超声科医生B的这一比例为96%（95%可信区间，0.81 - 0.99）。两名超声科医生均能充分观察到大多数主要解剖标志。
对三维容积数据集进行离线复查是确定孕晚期胎儿先露、羊水量、胎盘位置及估计胎儿体重的可靠方法。
