"SPECT/CT scanner is used to obtain both functional and anatomical details."
"Gamma radiation emitted from the radionuclide administered to the patient (most commonly Tc-99m) travels in all directions. A fraction of the radiation travels towards the gamma camera, of that an even smaller fraction travel at the correct angle to the septa of the collimator and is allowed to strike the crystal. When the gamma photon strikes the crystal a light photon is produced, this light photon is then converted into an electrical signal and amplified by the photomultiplier tube and is further amplified by the pre-amplifiers. The amount of light reaching the photomultiplier is proportional to the electrical signal produced 1,2."
"Analogue to digital converters then convert the signal. Positioning circuits then determine the X-position and Y-position of the interaction of the gamma ray and the crystal. The summing circuit produces an energy (Z) signal created by adding all of the individual signals from the pre-amplifiers. Correction circuits then correct for errors in the positioning and energy of the interactions 1. The Z-signal will pass through a pulse height analyser (PHA) before sending to a computer 4. The X, Y and Z signals are then processed and displayed on a computer 1,4."
Expected headings
"Design"
"Principle"
"Analogue to digital converters then convert the signal. Positioning circuits then determine the X-position and Y-position of the interaction of the gamma ray and the crystal. The summing circuit produces an energy (Z) signal created by adding all of the individual signals from the pre-amplifiers. Correction circuits then correct for errors in the positioning and energy of the interactions 1. The Z-signal will pass through a pulse height analyser (PHA) before sending to a computer 4. The X, Y and Z signals are then processed and displayed on a computer 1,4."