Abstract
The Daily intrinsic flood uniformity test of a gamma camera is required to be performed before using the gamma camera to acquire patient images. It is meant to detect changes in the performance of a gamma camera system that may affect the interpretation of clinical
Highlights
The Daily intrinsic flood uniformity test of a gamma camera is required to be performed before using the gamma camera to acquire patient images
Two different uniformity parameters that are usually measured during the test are: integral uniformity and differential uniformity. These are calculated for both the Central field of view (CFOV) and Useful field of view (UFOV) of the gamma camera respectively
We recently experienced a failure of a photomultiplier tubes (PMTs) in our camera which did not show on our clinical images, emphasizing the need for a daily uniformity test before acquisition of patient images
Summary
The Daily intrinsic flood uniformity test of a gamma camera is required to be performed before using the gamma camera to acquire patient images. We recently experienced a failure of a PMT in our camera which did not show on our clinical images, emphasizing the need for a daily uniformity test before acquisition of patient images. The flood uniformity image showed the PMT failure clearly and during the tuning of the PMTs, the camera reported a ‘No count or low count’ error thereby completing the tuning unsuccessfully All these were signs that there was a problem with a PMT or with several PMTs. Figure 1 shows a representative flood uniformity image and values. There was no apparent indication on the patient skeletal image that something was wrong with the camera
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