Q6. Post prostate implant dos implant. All of the following are possible reasons
ID: 214573 • Letter: Q
Question
Q6. Post prostate implant dos implant. All of the following are possible reasons why the dose distribution looks different from the preplan, except A. The preplan was done with ultrasound images, and the prostate volume may appear to be different on ultrasound and CT B. The implant was performed under ultrasound guidance, but the post-plan was done with CT images. C. The prostate swelled during the implant and shrank down again later D. The patient is in the lithotomy position for the implant and not for the CT E. The source strength of the seeds had decayed since the implant.Explanation / Answer
6.
Correct: the position of the patient does not affect the dose distribution. The implant is usually done in the lithotomy position and CT is done in the supine position.
Hence, the option (D) is correct.
Incorrect: all the other reasons give in the options affect the dose distribution.
Hence, the options (A), (B), (C) and (E) are incorrect.
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