目的　比较螺旋CT综合透明投影 (raysum - projection,RSP)与表面覆盖重建 (shadedsurfacedisplay ,SSD)诊断骨盆疾患的价值。方法　对 1 8例强直性脊柱炎 (AS)、5例骨良性占位病变、1 5例骨盆骨折的螺旋CT容积扫描数据分别进行RSP、SSD ,并与X线平片、CT平扫的检出进行比较。结果　 1 8例AS患者 ,RSP、SSD、平片的检出率分别为 93 .5 %、38.7%、83 .9% ,RSP对 1 2例 1～ 2级骶髂关节炎的骨硬化改变和关节面的囊状骨破坏与CT轴扫相符 ,较SSD和平片检出率高 ,并有显著性差异 (Ρ <0 .0 5) ,对 6例 3～ 4级骶髂关节炎的骶髂关节的狭窄范围较SSD显示清晰。 1 5例骨盆骨折 ,RSP、SSD、平片的确诊率分别为 88.5 %、85 .2 %、52 .5 % ,RSP对隐匿性骨折线检出优于SSD。 5例未侵及骨表面的骶髂骨良性占位 ,RSP均检出 ,SSD无法完整检出。结论　RSP集透视和三维效果为一体 ,是CT轴扫和SSD的有益补充 ,在骨盆疾患的诊断中有一定的应用价值 Objective To compare the value of spiral computed tomography (RSP) and shaded surface reconstruction (SSD) in the diagnosis of pelvic disorders. Methods Spiral CT volume scan data of 18 cases of ankylosing spondylitis (AS), 5 cases of benign bone lesions and 15 cases of pelvic fractures were performed RSP and SSD respectively, and were compared with X-ray and CT scan Out to compare. Results The detection rates of RSP, SSD and plain film in 93 AS patients were 93.5%, 38.7% and 83.9%, respectively. The changes of osteosclerosis in 12 patients with grade 1 or 2 sacroiliitis were assessed by RSP and The articular surface of the cystic bone destruction consistent with the CT axis scan, compared with the SSD and plain detection rate was high, and there was a significant difference (P <0. 05), 6 cases of sacroiliac sacroiliac 3 to 4 grade The narrow range of joints is cleaner than the SSD. In 15 cases of pelvic fractures, the diagnostic rates of RSP, SSD and plain film were 88.5%, 85.2% and 52.5%, respectively. RSP was superior to SSD in detecting occult fracture line. 5 cases of non-invasive surface of the sacral iliac benign space occupancy, RSP were detected, SSD can not be completely detected. Conclusion The combination of perspective and three-dimensional effect of RSP is a useful complement to CT scan and SSD, and has certain value in the diagnosis of pelvic disorders