Bahk Y W, Chung S K, Park Y H, Kim S H, Lee H K
Department of Radiology, Samsung Cheil Hospital, Seoul, Korea.
J Nucl Med. 1998 Jan;39(1):130-9.
Pinhole SPECT can generate sectional nuclear images of a normal and morbid ankle and hindfoot with remarkably enhanced resolution by portraying the topography and pathological alterations in great detail.
Pinhole SPECT was performed using a commercially available single-head, rotating gamma camera system by replacing the parallel-hole collimator used for planar SPECT with a pinhole collimator. The images were reconstructed in the same way as in planar SPECT by using the filtered back-projection algorithm and a Butterworth filter. First, we compared the scan resolution between the planar and pinhole SPECT images of a thyroid phantom and a normal ankle and hindfoot by working out pinhole SPECT anatomy with CT validation. Second, the clinical usefulness was assessed in one case each of fracture, reflex sympathetic dystrophy syndrome and rheumatoid arthritis of the ankle with radiographic correlation. The resolution of the pinhole SPECT and planar pinhole images was compared for these diseases.
The resolution of the pinhole SPECT of a thyroid phantom and of a normal ankle and hindfoot was significantly enhanced compared to the planar SPECT although image distortion was seen in the periphery of the field-of-view. The pinhole SPECT resolution was such that most of the anatomical landmarks were sharply delineated in the ankle and hindfoot and some useful diagnostic signs in the diseased ankle were visible.
Pinhole SPECT can be performed using a single-head gamma camera system and filtered back-projection algorithm. It generates sectional scan images of both normal and morbid ankle and hindfoot with enhanced resolution portraying many anatomical landmarks and pathological signs in useful detail.
针孔单光子发射计算机断层扫描（SPECT）可以通过极其详细地描绘正常和病态踝关节及后足的局部解剖结构和病理改变，生成具有显著增强分辨率的断层核素图像。
使用市售的单头旋转γ相机系统进行针孔SPECT检查，将用于平面SPECT的平行孔准直器替换为针孔准直器。图像通过使用滤波反投影算法和巴特沃斯滤波器，以与平面SPECT相同的方式重建。首先，通过用CT验证确定针孔SPECT解剖结构，我们比较了甲状腺模型以及正常踝关节和后足的平面和针孔SPECT图像之间的扫描分辨率。其次，通过影像学相关性评估了1例踝关节骨折、反射性交感神经营养不良综合征和类风湿关节炎患者的临床实用性。比较了这些疾病的针孔SPECT和平面针孔图像的分辨率。
与平面SPECT相比，甲状腺模型以及正常踝关节和后足的针孔SPECT分辨率显著提高，尽管在视野边缘可见图像失真。针孔SPECT的分辨率使得踝关节和后足的大多数解剖标志清晰可辨，并且在患病踝关节中一些有用的诊断体征可见。
针孔SPECT可以使用单头γ相机系统和滤波反投影算法进行。它可以生成正常和病态踝关节及后足的断层扫描图像，分辨率提高，能清晰显示许多解剖标志和病理体征。
