Gilja O H, Detmer P R, Jong J M, Leotta D F, Li X N, Beach K W, Martin R, Strandness D E
Medical Department A, Haukeland Hospital, University of Bergen, Norway.
Gastroenterology. 1997 Jul;113(1):38-49. doi: 10.1016/s0016-5085(97)70078-7.
BACKGROUND & AIMS: Three-dimensional (3D) ultrasound imaging of the total stomach volume has not yet been achieved. The aim of this study was to investigate whether a magnetic position sensor system for acquisition of 3D ultrasonograms could be used to determine gastric emptying rates and intragastric distribution.
A system for position and orientation measurement was interfaced to an ultrasound scanner. In vitro accuracy was evaluated by scanning a porcine stomach. Fourteen volunteers, with a median age of 35 years, were scanned fasting and postcibally by two-dimensional (2D) and 3D ultrasound after ingesting a 500-mL soup meal.
This 3D system yielded a strong correlation (r = 0.997) between true and estimated volumes in vitro. The limits of agreement were -9.1:70.1 mL in the volume range 1200-1900 mL. The intersubject variability of the total gastric volumes ranged from 12.5% to 46.0%, less than for antral area variability. The average half-emptying time was 22.1 +/- 3.8 minutes. Intragastric distribution of the meal, expressed as proximal distal volume, varied on average from 3.6 +/- 2.1 (5 minutes postpradially) to 2.7 +/- 1.9 (30 minutes postprandially).
This 3D ultrasound system using magnetic scanhead tracking showed excellent in vitro accuracy, calculated gastric emptying rates more precisely than by 2D ultrasound, and enabled estimation of intragastric distribution of a soup meal.
尚未实现对整个胃容积的三维（3D）超声成像。本研究的目的是调查用于获取3D超声图像的磁性位置传感器系统是否可用于确定胃排空率和胃内分布。
将一个位置和方向测量系统与超声扫描仪连接。通过扫描猪胃评估体外准确性。14名志愿者，中位年龄35岁，在摄入500毫升汤餐后，分别在空腹和餐后进行二维（2D）和3D超声扫描。
该3D系统在体外真实体积与估计体积之间产生了强相关性（r = 0.997）。在1200 - 1900毫升的体积范围内，一致性界限为-9.1:70.1毫升。胃总体积的受试者间变异性范围为12.5%至46.0%，小于胃窦面积变异性。平均半排空时间为22.1 +/- 3.8分钟。餐食在胃内的分布，以近端与远端体积表示，平均从餐后5分钟时的3.6 +/- 2.1变化至餐后30分钟时的2.7 +/- 1.9。
这种使用磁性扫描头跟踪的3D超声系统在体外显示出优异的准确性，比2D超声更精确地计算胃排空率，并能够估计汤餐在胃内的分布。
