Shady K L, Siegel M J, Brown J J
Mallinckrodt Institute of Radiology, Washington University School of Medicine, Department of Radiology, St. Louis, MO 63110.
AJR Am J Roentgenol. 1993 Oct;161(4):843-7. doi: 10.2214/ajr.161.4.8372772.
The purpose of this study was to compare gradient-recalled echo (GRE) with spin-echo (SE) MR imaging in the assessment of vessel patency and tumor margins in children with intraabdominal tumors.
Findings on GRE and SE images in 10 children with abdominal neoplasms were retrospectively evaluated and compared with pathologic findings or results of CT studies.
Detection of tumor thrombus was 100% with GRE sequences and 75% with SE sequences. The SE sequences yielded two false-positive diagnoses of tumor thrombosis, whereas the GRE sequences yielded no false-positive or false-negative diagnoses. In patients with extrinsic compression of the inferior vena cava by tumor, GRE images were consistently better than SE images for confirming vessel patency. GRE images also were superior to SE images at showing flow in mesenteric vessels, renal arteries, and renal veins. However, GRE images displayed tumor margins less well than SE images did, and they were also more susceptible to ghosting artifacts.
Our results suggest that the GRE sequence is a useful adjunct to SE sequences for evaluating vascular involvement in children with abdominal tumors.
本研究旨在比较梯度回波（GRE）与自旋回波（SE）磁共振成像在评估腹内肿瘤患儿血管通畅性和肿瘤边界方面的差异。
回顾性评估10例腹部肿瘤患儿的GRE和SE图像表现，并与病理结果或CT检查结果进行比较。
GRE序列对肿瘤血栓的检出率为100%，SE序列为75%。SE序列出现了2例假阳性肿瘤血栓诊断，而GRE序列未出现假阳性或假阴性诊断。在肿瘤导致下腔静脉外部受压的患者中，GRE图像在确认血管通畅性方面始终优于SE图像。GRE图像在显示肠系膜血管、肾动脉和肾静脉血流方面也优于SE图像。然而，GRE图像显示肿瘤边界的效果不如SE图像，且更容易出现鬼影伪影。
我们的结果表明，GRE序列是评估腹部肿瘤患儿血管受累情况时SE序列的有用辅助手段。
