What is the function of the cathode in an X-ray tube? The cathode in an X-ray tube is responsible for producing and directing electrons toward the anode. It generates electrons through thermionic emission and focuses them into a narrow beam…
What are the main components of an X-ray machine? An X-ray machine consists of three principal components: the X-ray tube, the high-voltage generator, and the control system. Together, these components accelerate electrons, convert their kinetic energy into X-rays, and regulate…
What is a dose calibrator and how is it quality controlled? A dose calibrator is a device used in nuclear medicine to measure the activity of a radiopharmaceutical before it is administered to a patient. It ensures that the prescribed…
What quality control tests are required for radiopharmaceuticals? Radiopharmaceutical quality control ensures that a preparation is safe, chemically correct, and suitable for clinical use before administration. QC testing typically assesses radionuclidic purity, radiochemical purity, chemical purity, pH, sterility, and apyrogenicity.…
What quality control tests are required for PET scanners? Quality control (QC) for PET scanners ensures accurate detection of annihilation photons, correct timing alignment, uniform detector response, and reliable quantitative performance. Routine PET QC typically includes daily system checks, blank…
What is centre of rotation correction in SPECT? Centre of rotation (COR) correction in SPECT ensures that the gamma camera rotates precisely around a fixed central axis during image acquisition. If the mechanical or electronic centre of rotation is misaligned,…
What is spatial resolution testing in nuclear medicine? Spatial resolution testing in nuclear medicine assesses the ability of a gamma camera or SPECT system to distinguish between two closely spaced sources of radioactivity. It evaluates how accurately small structures can…
What is energy window calibration and why is it important? Energy window calibration, often called energy peaking, ensures that the gamma camera’s energy window is correctly centred on the photopeak of the radionuclide being used. It is important because accurate…
What is uniformity testing in gamma cameras? Uniformity testing in gamma cameras assesses whether the detector produces a uniform image when exposed to a uniform radiation field. It is performed daily to ensure that the detector response is consistent across…
What quality control tests are performed on a gamma camera? Quality control tests on a gamma camera are performed to ensure accurate photon detection, uniform image formation, correct energy discrimination, and mechanical alignment. These tests assess detector uniformity, energy calibration,…
