Guiding curve based on the normal breathing as monitored by thermocouple for regular breathing.
Adapting radiation fields to a moving target requires information continuously on the location of internal target by detecting it directly or indirectly. The aim of this study is to make the breathing regular effectively with minimizing stress to the patient. A system for regulating patient's breath consists of a respiratory monitoring mask (ReMM), a thermocouple module, a screen, inner earphones, and a personal computer. A ReMM with thermocouple was developed previously to measure the patient's respiration. A software was written in LabView 7.0 (National Instruments, TX), which acquires respiration signal and displays its pattern. Two curves are displayed on the screen: One is a curve indicating the patient's current breathing pattern; the other is a guiding curve, which is iterated with one period of the patient's normal breathing curve. The guiding curves were acquired for each volunteer before they breathed with guidance. Ten volunteers participated in this study to evaluate this system. A cycle of the representative guiding curve was acquired by monitoring each volunteer's free breathing with ReMM and was then generated iteratively. The regularity was compared between a free breath curve and a guided breath curve by measuring standard deviations of amplitudes and periods of two groups of breathing. When the breathing was guided, the standard deviation of amplitudes and periods on average were reduced from 0.0029 to 0.00139 (arbitrary units) and from 0.359 s to 0.202 s, respectively. And the correlation coefficients between breathing curves and guiding curves were greater than 0.99 for all volunteers. The regularity was improved statistically when the guiding curve was used.
Lim
Sangwook
S
Department of Radiation Oncology, Kosin University Gospel Hospital, Kosin University College of Medicine, 34 Amnam-dong, Seo-gu, Busan 602702, Korea.
Park
Sung Ho
SH
Ahn
Seung Do
SD
Suh
Yelin
Y
Shin
Seong Soo
SS
Lee
Sang-wook
SW
Kim
Jong Hoon
JH
Choi
Eun Kyoung
EK
Yi
Byong Yong
BY
Kwon
Soo Il
SI
Kim
Sookil
S
Jeung
Tae Sig
TS
D003201:Computers; D004867:Equipment Design; D006801:Humans; D009068:Movement; D011878:Radiotherapy / Q000379:methods*; D012119:Respiration; D012984:Software; D013997:Time Factors; D014584:User-Computer Interface