Shimizu T, Yoshikawa S, Uesugi Y, Tabuchi K, Nakata Y, Matsui R, Sueyoshi K, Narabayashi I
Department of Radiology, Osaka Medical College, Japan.
Radiat Med. 1999 Mar-Apr;17(2):151-4.
To assess the image quality of multiple threshold display (MTD) as a new technique for generating three-dimensional (3D) pulmonary computed tomographic (CT) angiographic images.
We used MTD, a type of shaded surface display (SSD) offering the selection of multiple thresholds and transparencies, to reconstruct 3D-CT angiograms from enhanced helical CT data sets in 33 patients with lung disease. In MTD, eight thresholds of CT values are selected, and transparency is assigned to each. The selected voxels, ranging from -600 to 1,000 Hounsfield Units, were divided into eight classes, and transparency ranging from 0 to 100% was assigned to each. The CT scanner employed was a Toshiba Xvigor. MTD and SSD images were generated by using an Xtension with a Sun SPARC station 20, and they were compared by two radiologists.
The image quality of MTD images was superior to that of SSD images (p < 0.01), because the MTD images demonstrated clearly both the major and small vessels.
MTD is a useful technique for 3D pulmonary CT angiography.
评估多阈值显示（MTD）作为一种生成三维（3D）肺部计算机断层扫描（CT）血管造影图像的新技术的图像质量。
我们使用MTD（一种提供多个阈值和透明度选择的阴影表面显示（SSD）类型），从33例肺部疾病患者的增强螺旋CT数据集中重建3D-CT血管造影。在MTD中，选择八个CT值阈值，并为每个阈值指定透明度。选定的体素范围为-600至1000亨氏单位，分为八类，并为每类指定0至100%的透明度。使用的CT扫描仪是东芝Xvigor。通过使用配备Sun SPARC工作站20的扩展软件生成MTD和SSD图像，并由两位放射科医生进行比较。
MTD图像的质量优于SSD图像（p < 0.01），因为MTD图像能清晰显示大血管和小血管。
MTD是一种用于3D肺部CT血管造影的有用技术。
