Abstract
Purpose: To assess the accuracy and response characteristics of the novel Respisens™ intra‐fraction motion monitoring device. Methods: The Respisens™ (CIVCO, Orange City IA) device is a highly sensitive, real time (20Hz sampling frequency) magnetic distance sensor used for patient motion tracking during radiotherapy—i.e. intra‐fraction motion monitoring. The device consists of both a miniaturized magnetic transmitter and receiver which measure the coplanar distance between the two probes real‐time. The device was evaluated for five different characteristic prior to clinical implementation: (1) Distance accuracy, (2) Distance range, (3) Off‐plane (non‐coplanar) response, (4) Angular response, and (5) Displacement detection accuracy. Results: The Respisens™ showed a distance tracking range from 7.5 to 23.5cm. The distance accuracy was 16.5cm, a varying response of up to 2.0% was noted. Conclusions: Based on the preliminary findings, the Respisens™ intra‐fraction motion monitoring device can be used to accurately measure patient motion realtime. Precaution must be taken to ensure that the probes are coplanar and not rotated relative to one another.
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