Tuite M J, Yandow D R, De Smet A A, Orwin J F, Quintana F A
Department of Radiology, University of Wisconsin Clinical Science Center, Madison 53792-3252, USA.
Skeletal Radiol. 1995 Oct;24(7):495-8. doi: 10.1007/BF00202144.
To determine the effect of decreasing the field of view (FOV) on the accuracy of MR for diagnosing rotator cuff tears.
One hundred shoulder MR scans with surgical correlation were evaluated for the presence or absence of a cuff tear. The sensitivity and specificity of MR relative to the surgical results were determined for the 59 patients scanned with a 24-cm FOV, and the 41 patients scanned with an 18-cm FOV. All other imaging parameters including acquisition time were identical. The sensitivity and specificity of the two groups were compared using a t-test.
The specificity of MR for diagnosing a rotator cuff tear improved from 0.65 for the 24-cm FOV group to 0.89 for the 18-cm FOV group (P = 0.04). The sensitivity changed from 0.91 to 0.96 (P = 0.25).
Reducing the FOV from 24 cm to 18 cm results in a statistically significant improvement in specificity of MR for diagnosing rotator cuff tears.
确定减小视野（FOV）对磁共振成像（MR）诊断肩袖撕裂准确性的影响。
对100例有手术对照的肩部MR扫描进行评估，以确定是否存在肩袖撕裂。对于59例采用24厘米视野扫描的患者和41例采用18厘米视野扫描的患者，确定MR相对于手术结果的敏感性和特异性。所有其他成像参数（包括采集时间）均相同。使用t检验比较两组的敏感性和特异性。
MR诊断肩袖撕裂的特异性从24厘米视野组的0.65提高到18厘米视野组的0.89（P = 0.04）。敏感性从0.91变为0.96（P = 0.25）。
将视野从24厘米减小到18厘米可使MR诊断肩袖撕裂的特异性在统计学上有显著提高。
