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An infrared interactive patient position guidance and acquisition control system for use during radiotherapy treatment

Published online by Cambridge University Press:  06 April 2017

Hiraku Fuse ,
Kenji Komatsu ,
Hiroyuki Arakawa ,
Takeji Sakae  and
Fujisaki Tatsuya
Hiraku Fuse*
Affiliation:
Department of Radiological Sciences, Ibaraki Prefectural University of Health Sciences, Inashiki-gun, Ibaraki, Japan
Kenji Komatsu
Affiliation:
Department of Radiological Technology, Hitachi General Hospital, Hitachi, Ibaraki, Japan
Hiroyuki Arakawa
Affiliation:
Department of Radiological Technology, Seirei Sakura Citizen Hospital, Sakura, Chiba, Japan
Takeji Sakae
Affiliation:
Faculty of Medicine, University of Tsukuba, Tsukuba, Ibaraki, Japan
Fujisaki Tatsuya
Affiliation:
Department of Radiological Sciences, Ibaraki Prefectural University of Health Sciences, Inashiki-gun, Ibaraki, Japan
*
Correspondence to: Hiraku Fuse, Department of Radiological Sciences, Ibaraki Prefectural University of Health Science, 4669-2 Ami-machi, Inashiki-gun, Ibaraki 300-0331, Japan. Tel: +81 298 40 2218. Fax: +81 298 40 2318. E-mail: fuseh@ipu.ac.jp
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Abstract

Background

The control of patient position, posture and respiratory movements during radiotherapy is important for effective and specific treatment of malignancy. We have developed an infrared (IR) interactive patient position guidance and acquisition control system for clinical use, comprising IR cameras, IR markers and dedicated software.

Materials and methods

We evaluated the system with ten healthy volunteers and ten experienced operators. IR markers were placed on the body surface. Their positions were calculated using vectors of three translational and three rotational parameters, and the intrafractional error for each marker was acquired with and without respiratory motion. The inclusion of multiple positioning markers allowed for real-time visualisation of the patient posture, with feedback on misalignment and required postural adjustments.

Results

The positioning time was 73 seconds (with a minimum period of 39 seconds), which was significantly shorter than for conventional line alignment. A comparison of positioning reproducibility between conventional line alignment and this system was <3·5 mm and was not patient dependent or operator dependent. An intrafractional error of displacement of up to 10·0 mm was found in the right iliac crest.

Conclusions

This IR interactive system was shown to be high utility and suitable for monitoring patient position, posture and respiratory movements during radiotherapy.

Keywords

infraredpositioning guidanceposture controlradiotherapyrespiratory control
Type
Original Articles
Information
Journal of Radiotherapy in Practice , Volume 16 , Issue 3 , September 2017 , pp. 303 - 310
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Copyright
© Cambridge University Press 2017 

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