Table 3.

The questionnaire with 10 questions sent to the clinics

	Question
1.	Which TPS do you use in your clinic?
2.	Which type of radiation source do you use?
3.	Which CTV to PTV margin do you apply (if you are using PTV)?
4.	How many catheters did you use for the treatment plan?
5.	Which method for dose planning did you use? a. Manual, graphic, inverse, or a combination b. Write shortly about the dose planning method
6.	How did you place the source positions? a. Distance between the source positions? b. Did the offset from the catheter tip differ between the catheters or were the offsets the same?
7.	Which dose criterion are you aiming for?
8.	Do you have constraints on how to place the catheters in the prostate? If so, please describe.
9.	Which dose voxel size are you using for dose calculation?
10.	Do you use nominal source strength or actual source strength?