Honda N, Machida K, Mamiya T, Takahashi T, Takishima T, Hasegawa N, Kamano T, Hashimoto M, Ohno K, Hosoba M
Department of Radiology, Saitama Medical Center, Saitama Medical School, Japan.
Radiat Med. 1989 May-Jun;7(3):124-8.
The optimum Butterworth-Wiener filter (BWF) for the preprocessing of N-isopropyl-p-[I-123]-iodoamphetamine (I-123 IMP) SPECT was determined by a simulation experiment. Sixty-four images of the brain phantom containing 14.8 MBq of I-123 IMP were collected with a gamma camera equipped with a slant hole collimator during a 360-degree rotation. The images were processed with 27 BWFs of different shapes, followed by SPECT image reconstruction and visual comparison. The optimum BWF had a cutoff frequency of 0.25/pixel, FWHM of four pixels, and constant of 0.05. The image quality was greatly affected by the cutoff frequency of BWF used for preprocessing.
通过模拟实验确定了用于N-异丙基-p-[I-123]-碘安非他明（I-123 IMP）单光子发射计算机断层显像（SPECT）预处理的最佳巴特沃斯-维纳滤波器（BWF）。在360度旋转过程中，使用配备倾斜孔准直器的γ相机采集了64张含有14.8兆贝克勒尔I-123 IMP的脑模体图像。这些图像用27种不同形状的BWF进行处理，随后进行SPECT图像重建和视觉比较。最佳BWF的截止频率为0.25/像素，半高宽为4像素，常数为0.05。预处理所用BWF的截止频率对图像质量有很大影响。
