CMD Clinical Oncology & Treatment Techniques

Question 1

Which imaging modality is most commonly used for radiation therapy simulation and treatment planning due to its electron density information?

Accepted Answer

CT (Computed Tomography)

Answer

MRI

Answer

PET scan

Answer

Ultrasound

Question 2

In ICRU Report 62, which volume encompasses the Clinical Target Volume (CTV) plus a margin for setup uncertainty and organ motion?

Accepted Answer

Planning Target Volume (PTV)

Answer

Gross Tumor Volume (GTV)

Answer

Internal Target Volume (ITV)

Answer

Organ at Risk (OAR)

Question 3

Which technique uses multiple non-coplanar arcs or beams with modulated intensity to deliver highly conformal dose distributions?

Accepted Answer

Intensity-Modulated Radiation Therapy (IMRT)

Answer

3D Conformal Radiation Therapy (3DCRT)

Answer

Total Body Irradiation (TBI)

Answer

Electron arc therapy

Question 4

For breast cancer radiation therapy, the tangential field technique is designed primarily to:

Accepted Answer

Treat the breast/chest wall while minimizing lung and heart dose

Answer

Cover all regional lymph nodes simultaneously

Answer

Maximize skin dose

Answer

Treat bilateral breast fields equally

Question 5

Which dosimetric parameter is most critical to monitor when treating head and neck cancers with IMRT to prevent xerostomia?

Accepted Answer

Mean parotid gland dose

Answer

Maximum spinal cord dose only

Answer

Minimum PTV dose

Answer

V95 of the mandible

Question 6

Stereotactic Radiosurgery (SRS) is characterized by:

Accepted Answer

High dose per fraction, few fractions, and submillimeter precision

Answer

Conventional fractionation over 5–6 weeks

Answer

Large treatment volumes with uniform dose

Answer

Multiple isocenters all treated over many fractions