2017_IGRT course book
EPIDs: Pros and cons
Isocentric alignment: the imaging beam is the treatment beam (obs: gravity)
Monoscopic: needs several angles for 3D positioning information
Considerable dose for large FOV images outside the target volume (1 to 5 MU per image)
The imaging dose to the patient can be easily calculated in the TPS
Low contrast (bony structures or markers)
Verifies the field outline with respect to the patient anatomy
Can use the EPID for transmission (in vivo) dosimetry
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