Mori K, Katayama S, Okuyama A, Sasagawa M, Moriyama N
Department of Thoracic Disease, Tochigi Cancer Center.
Nihon Igaku Hoshasen Gakkai Zasshi. 1993 Jul 25;53(7):812-9.
The purpose of this study was to evaluate the diagnostic capability of helical scan CT (HS-CT). We investigated the ability of HS-CT to detect lesions by scanning 129 small nodular lesions in the lung field in six cases of pulmonary metastasis. HS-CT was then employed to scan the same regions at table slide speeds of 20 mm/sec and 25 mm/sec. The acquired images were recorded on film and a video tape recorder (VTR), using axial multiplanar reconstruction. We then compared the various images to evaluate the effectiveness of conventional CT (slice thickness: 10 mm, table slide pitch: 10 mm) and HS-CT in visualizing the lesions. HS-CT images acquired at 20 mm/sec and at 25 mm/sec were equally effective in visualizing the lesions. Diagnostic capability was significantly lower in the apical area than in the middle and subdiaphragmatic areas. VTR images were better than film images in terms of diagnostic capability. The disadvantage of VTR images was that VTR processing required much time and labor, and thus is not practical at present. In conclusion, HS-CT is useful in detecting small nodular lesions in the lung field. However, the scanning conditions of HS-CT and interpretation of images, especially in the apical area, require further improvement.
本研究的目的是评估螺旋扫描CT（HS-CT）的诊断能力。我们通过对6例肺转移患者肺野内的129个小结节病灶进行扫描，研究了HS-CT检测病灶的能力。然后以20毫米/秒和25毫米/秒的床速对相同区域进行HS-CT扫描。采集的图像通过轴向多平面重建记录在胶片和录像带上。然后我们比较了各种图像，以评估传统CT（层厚：10毫米，床速螺距：10毫米）和HS-CT在显示病灶方面的有效性。以20毫米/秒和25毫米/秒采集的HS-CT图像在显示病灶方面同样有效。肺尖区域的诊断能力明显低于中叶和膈下区域。就诊断能力而言，录像带图像优于胶片图像。录像带图像的缺点是录像带处理需要大量时间和人力，因此目前不实用。总之，HS-CT在检测肺野内小结节病灶方面是有用的。然而，HS-CT的扫描条件和图像解读，尤其是在肺尖区域，需要进一步改进。
