Exam 24: Photon Dose Distributions

At what point does the treatment planning process begin?

In which tissue heterogeneity correction method are primary and scatter separated?

Which of the following is the most favorable situation for the overall goal of radiation therapy?

In which tissue heterogeneity correction method are both the field size and the depth "scaled" to account for the presence of heterogeneities?

During IMRT treatments, how is the intensity of the beam altered?

What is (are)spatial representation(s)of the magnitude of the dose produced by a source of radiation?

What are the appropriate wedges needed for beams with a hinge angle of 120 degrees?

Which of the following imitates a radiograph by reconstructing the diverge-corrected patient anatomy from the CT data set?

What determines the hinge angle?

Which type of IMRT treatment involves the "sliding window" technique?

The process of identifying structures, target volumes, or normal tissues, by creating contours around them, is often called _____________________.

What is the most common field arrangement used in radiation therapy?

Which of the following is the palpable, visible, or demonstrable extent and location of malignant growth and is the volume of known disease?

The internal target volume (ITV)is the __________.

In the effective source-skin distance method and TAR method of correcting isodose curves for oblique incidence, what does the factor h represent?

Beam attenuation in energy ranges typically used in radiation therapy is primarily the result of which type of interaction?

In the convolution algorithm, primary fluence is represented by what symbol?

Which type of intensity-modulated radiation therapy treatment delivery has the gantry in a fixed position with an initial multileaf collimators (MLC)pattern?

The percent depth dose curve (PDD)is a representation of dose variation in __________ dimensions.

Which of the following statements is false concerning beam profiles?