Radiotherapy Treatment Planning Quiz

What is the primary aim of Radiation Therapy Treatment Planning (RTP)?

• To increase the patient's exposure to radiation

• To localize the tumor volume and define the target volume for treatment

• To minimize the use of imaging techniques

• To eliminate the need for patient immobilization

Which technique maintains a constant distance between the source and the tumor center?

• 3D conformal technique

• SAD technique

• SSD technique

• 2D conformal technique

What does the acronym GTV stand for in treatment planning?

• Guided Target Volume

• Gross Tumor Volume

• Geometric Treatment Volume

• General Treatment Volume

What is the purpose of using organ shielding during radiotherapy?

• To increase the dose to the tumor

• To protect normal tissues from unnecessary radiation exposure

• To enhance the imaging quality

• To reduce the treatment time

What does the ICRU report 50 recommend regarding target dose uniformity?

• Within +5% and -10%

• No specific recommendation

• Within +10% and -5%

• Within +7% and -5%

What is the Clinical Target Volume (CTV)?

• The volume containing only the visible tumor

• The volume that includes the GTV and surrounding tissues with potential microscopic disease

• The volume that is treated with the highest dose

• The volume that is not affected by organ motion

What does the term 'Organ at Risk' (OAR) refer to?

• An organ that is not affected by radiation

• An organ whose sensitivity to radiation may be significant compared to its tolerance

• An organ that requires higher doses for treatment

• An organ that is always shielded during treatment

Which of the following is a common method for verifying patient setup?

• Using a CT simulator

• Using a port film or Electronic Portal Imaging Devices (EPID)

• Using a conventional X-ray

• Using a diagnostic ultrasound

What is the significance of Dose Volume Histograms (DVHs) in treatment planning?

• They represent the dose over time

• They show the volume of an organ receiving a certain dose

• They are used to generate X-rays

• They measure the accuracy of beam alignment

How is the therapeutic range for electron beam therapy determined?

• Using the depth of the 100% dose level

• By the distance from the source to the tumor

• Using the depth of the 90% dose level (R90)

• Through the gantry's rotational speed