放射線治療原理與技術學題庫下載題庫

P205

The nomenclature of virtual simulation arises out of the fact that both the patient and the treatment

machine are virtual—the patient is represented by CT images and the treatment machine is

modeled by its beam geometry and expected dose distribution. The simulation film in this case is a

reconstructed image called the DRR (digitally reconstructed radiograph), which has the appearance

of a standard 2-D simulation radiograph but is actually generated from CT scan data by mapping

average CT values computed along ray lines drawn from a “virtual source” of ...

Khan's the physics of radiation therapy

P205

The nomenclature of virtual simulation arises out of the fact that both the patient and the treatment

machine are virtual—the patient is represented by CT images and the treatment machine is

modeled by its beam geometry and expected dose distribution. The simulation film in this case is a

reconstructed image called the DRR (digitally reconstructed radiograph), which has the appearance

of a standard 2-D simulation radiograph but is actually generated from CT scan data by mapping

average CT values computed along ray lines drawn from a “virtual source” of radiation to the location

of a “virtual film.” DRR is essentially a calculated (i.e., computer-generated) port film that serves

as a simulation film.