Prescribing, Recording, and Reporting Photon Beam IMRT ICRU 83

ICRU 83 defines the Planning Target Volume (PTV) as:

The volume that encompasses the Clinical Target Volume (CTV) and accounts for setup errors and internal organ motion

Dose conformity in IMRT according to ICRU 83 is best evaluated by:

The ratio of prescription isodose surface volume to PTV

For reporting the maximum dose to an Organ at Risk (OAR), ICRU 83 defines Dmax as:

The dose to 0.03 cm³

In ICRU 83, the preferred method for evaluating and comparing IMRT plans is:

Dose-Volume Histograms (DVH)

T/F: ICRU 83 recommends using dose-volume metrics (such as D98%, D50%, D2%) rather than single point dose for reporting target coverage.

True

T/F: ICRU 83 emphasizes reporting dose to OAR using both mean dose for parallel organs and max dose for serial organs.

True

The recommended dose reporting for parallel organs is:

Mean dose

The Clinical Target Volume (CTV) in ICRU 83 is defined as:

Visible tumor plus microscopic extension

The factor that ICRU 83 identifies as contributing to uncertainties in delivered dose is:

Setup errors and organ motion

T/F: In ICRU 83, the CTV includes margin for setup uncertainties and patient motion

False