Breath-hold monitoring and visual feedback for radiotherapy using a charge-coupled device camera and a head-mounted display: system development and feasibility.
OBJECTIVE
The aim of this study was to present the technical aspects of the breath-hold technique with respiratory monitoring and visual feedback and to evaluate the feasibility of this system in healthy volunteers.


METHODS
To monitor respiration, the vertical position of the fiducial marker placed on the patient's abdomen was tracked by a machine vision system with a charge-coupled device camera. A monocular head-mounted display was used to provide the patient with visual feedback about the breathing trace. Five healthy male volunteers were enrolled in this study. They held their breath at the end-inspiration and the end-expiration phases. They performed five repetitions of the same type of 15-s breath-holds with and without a head-mounted display, respectively. A standard deviation of five mean positions of the fiducial marker during a 15-s breath-hold in each breath-hold type was used as the reproducibility value of breath-hold.


RESULTS
All five volunteers well tolerated the breath-hold maneuver. For the inspiration breath-hold, the standard deviations with and without visual feedback were 1.74 mm and 0.84 mm, respectively (P = 0.20). For the expiration breath-hold, the standard deviations with and without visual feedback were 0.63 mm and 0.96 mm, respectively (P = 0.025).


CONCLUSIONS
Our newly developed system might help the patient achieve improved breath-hold reproducibility.
Yoshitake
Tadamasa
T
Department of Clinical Radiology, Graduate School of Medical Sciences, Kyushu University, Maidashi 3-1-1, Higashi-ku, Fukuoka 812-8582, Japan. chukichi@radiol.med.kyushu-u.ac.jp
Nakamura
Katsumasa
K
Shioyama
Yoshiyuki
Y
Nomoto
Satoshi
S
Ohga
Saiji
S
Toba
Takashi
T
Shiinoki
Takehiro
T
Anai
Shigeo
S
Terashima
Hiromi
H
Kishimoto
Junji
J
Honda
Hiroshi
H
D000005:Abdomen / Q000502:physiology; D000328:Adult; D005240:Feasibility Studies; D005246:Feedback; D006801:Humans; D008113:Liver Neoplasms / Q000532:radiotherapy; D008175:Lung Neoplasms / Q000532:radiotherapy; D008297:Male; D008875:Middle Aged; D008991:Monitoring, Physiologic / Q000295:instrumentation*; D009038:Motion; D009068:Movement; D011878:Radiotherapy / Q000379:methods; D012119:Respiration; D013238:Stereotaxic Techniques; D013909:Thorax / Q000502:physiology