Schaefer A, Oberhausen E
Abteilung Nuklearmedizin, Universität des Saarlandes, Homburg, FRG.
Nuklearmedizin. 1995 Feb;34(1):40-6.
The performance of a modified Multispect 2 gamma camera, which was supplied with two pairs of collimators constructed for imaging positron emitters was tested. The measurements involved the determination of sensitivity and of spatial resolution. The septal penetration was calculated approximately using two different methods. The spatial resolution determined by FWHM as measured by planar imaging in water at 10 cm distance from the collimator was evaluated as 14.0 mm with collimator 511-A and 12.5 mm with collimator 511-B. Using a Gaussian fit of the line-spread function septal penetrations of 12% with collimator 511-A and of 36% with collimator 511-B were calculated. The absolute system sensitivity measured with 18F was 66 cpm with collimator 511-A and 98.7 cpm/37 kBq with collimator 511-B. The high sensitivity with collimator 511-B may be explained, at least partially, by the high septal penetration.
对一台经过改进的Multispect 2型γ相机的性能进行了测试，该相机配备了两对用于正电子发射体成像的准直器。测量内容包括灵敏度和空间分辨率的测定。采用两种不同方法大致计算了隔片穿透率。通过在距离准直器10 cm的水中进行平面成像测量的半高宽（FWHM）确定的空间分辨率，使用511 - A准直器时评估为14.0 mm，使用511 - B准直器时为12.5 mm。通过对线扩展函数进行高斯拟合，计算出使用511 - A准直器时隔片穿透率为12%，使用511 - B准直器时为36%。用18F测量的绝对系统灵敏度，使用511 - A准直器时为66计数/分钟，使用511 - B准直器时为98.7计数/分钟/37 kBq。511 - B准直器的高灵敏度至少部分可以用高隔片穿透率来解释。
