Freeny P C, Nghiem H V, Winter T C
Department of Radiology SB-05, University of Washington School of Medicine, Seattle 98195.
Radiology. 1995 Jan;194(1):83-90. doi: 10.1148/radiology.194.1.7997587.
To determine the optimal scanning parameters for helical computed tomography during arterial portography (CTAP) of the liver.
Single- and double-helix CTAP were performed in 11 and 20 adult patients, respectively, with 200 mL of contrast material (300 mg of iodine per milliliter) injected at a rate of 3 mL/sec via the superior mesenteric artery. Scanning delays were adjusted for single-helix CTAP so the last scan was obtained at 66 seconds. Delays were adjusted for double-helix CTAP so the last scan during the first helix (CTAP-1) was obtained 10 seconds before the end of the injection at 56 seconds and the first scan during the second helix (CTAP-2) was obtained at the end of the injection at 66 seconds.
Single-helix CTAP scans were of poor quality owing to multiple perfusion abnormalities. Lesion detection for double-helix CTAP-1 was 93.2% and was 100% for CTAP-2, and CTAP-2 scans had significantly fewer perfusion abnormalities.
A scanning delay of 60-66 seconds appears to be optimal. The CTAP-1 scans showed no useful information and need not be acquired.
确定肝脏动脉门静脉造影（CTAP）期间螺旋计算机断层扫描的最佳扫描参数。
分别对11例和20例成年患者进行单螺旋和双螺旋CTAP检查，经肠系膜上动脉以3 mL/秒的速率注入200 mL造影剂（每毫升含300 mg碘）。单螺旋CTAP的扫描延迟进行了调整，以便在66秒时获得最后一次扫描。双螺旋CTAP的延迟进行了调整，以便在第一次螺旋扫描（CTAP-1）期间，在注射结束前10秒即56秒时获得最后一次扫描，在第二次螺旋扫描（CTAP-2）期间，在注射结束时即66秒时获得第一次扫描。
由于多种灌注异常，单螺旋CTAP扫描质量较差。双螺旋CTAP-1的病变检测率为93.2%，CTAP-2为100%，且CTAP-2扫描的灌注异常明显较少。
60 - 66秒的扫描延迟似乎是最佳的。CTAP-1扫描未显示有用信息，无需采集。
