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Key components of gamma and PET cameras, houses the detector with a large…
Key components of gamma and PET cameras
Gamma Camera
Sodium Iodide Crystal
produce many photons of visible lights
Hygroscopic
front surface coated with low Z number metal
rear surface coated with transparent coating
Thallium-doped sodium iodide (NaI)
Photomultiplier tubes
information on the spatial position (x,y) of each incoming gamma ray
collect visible photons
convert it to electron
multiply no. of electron
Collimator
Collimator's sensitivity and resolution depends on:
thickness of septa
length of the holes
hole size
energy of gamma rays
parallel hole collimator
select direction of the rays falling on the crystal
different collimator for different procedures
PET Camera
Subject table
Detector/Camera system
Gantry (frame)
Computer system
houses the detector with a large patient port (opening)
moves in and out of the patient port and allowing for a complete scan
captures the images
process and presents the images
mostly used
as the scintillation crystal
gamma photon interact with an crystal
allows gamma photons pass through
visible photons can pass through to the photomultiplier tubes
giving a voltage pulse