Advanced Physics for Brachytherapy 2018

Regarding QA imaging in brachytherapy, please point the wrong statement

A. Most convenient: contouring, catheter reconstruction and calculation on the same image set. B. CT, when used in intraoperative prostate, has the problem that the electronic density can not be obtained. C. MRI has excellent soft tissue definition. The distortion must be evaluated. D. Society Recommendations are available to perform QA/QC of all these image modalities .