Analysis of couch position tolerance limits to detect mistakes in patient setup.

Journal of Applied Clinical Medical Physics
Scott W HadleyKwok L Lam

Abstract

This work investigates the use of the tolerance limits on the treatment couch position to detect mistakes in patient positioning and warn users of possible treatment errors. Computer controlled radiotherapy systems use the position of the treatment couch as a surrogate for patient position and a tolerance limit is applied against a planned position. When the couch is out of tolerance a warning is sent to a user to indicate a possible mistake in setup. A tight tolerance may catch all positioning mistakes while as the same time sending too many warnings; while a loose tolerance will not catch all mistakes. We develop a statistical model of the absolute position for the three translational axes of the couch. The couch position for any fraction is considered a random variable x(i). The ideal planned couch position x(p) is unknown before a patient starts treatment and must be estimated from the daily positions x(i). As such x(p) is also a random variable. The tolerance, tol, is applied to the difference between the daily and planned position, d(i) = x(i) - x(p). The di is a linear combination of random variables and therefore the density of di is the convolution of distributions of xi and xp. Tolerance limits are based on the standa...Continue Reading

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Citations

Jan 27, 2015·Medical Dosimetry : Official Journal of the American Association of Medical Dosimetrists·Wilhelmus J M de Kruijf, Rob J W Martens
Jun 24, 2015·Journal of Applied Clinical Medical Physics·Kiernan T McCulloughBrian Wang
Aug 8, 2018·Journal of Applied Clinical Medical Physics·Daniel L SaenzNiko Papanikolaou
Nov 19, 2019·Journal of Applied Clinical Medical Physics·Pingfang TsaiGuanghua Yan
Dec 9, 2016·Journal of Applied Clinical Medical Physics·Bonnie ChinskyJohn C Roeske

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