Table 3.

Number of true-errors and false-accurate detected using the PSD and expected from planning in function of the acceptable range. A −5 mm displacement of the catheters was introduced in the plan and the dose then delivered. When the PSD-measured dose rate exceeded the acceptable range value, an error was reported. The case represented here is from treatment delivery with the PSD inserted in the urethra and expected to be aligned with position #9.

		Acceptable range
		3%	5%	10%	20%
PSD	True-errors	43	43	40	35
	False-accurate	0	0	3	8
Plan	True-errors	43	41	40	35
	False-accurate	0	2	3	8