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| Research article summary (published 29 Sep 2009): |
Effect of audio coaching on correlation of abdominal displacement with lung tumor motion.
Full Abstract
PURPOSE: To assess the effect of audio coaching on the time-dependent behavior of the correlation between abdominal motion and lung tumor motion and the corresponding lung tumor position mismatches. METHODS AND MATERIALS: Six patients who had a lung tumor with a motion range >8 mm were enrolled in the present study. Breathing-synchronized fluoroscopy was performed initially without audio coaching, followed by fluoroscopy with recorded audio coaching for multiple days. Two different measurements, anteroposterior abdominal displacement using the real-time positioning management system and superoinferior (SI) lung tumor motion by X-ray fluoroscopy, were performed simultaneously. Their sequential images were recorded using one display system. The lung tumor position was automatically detected with a template matching technique. The relationship between the abdominal and lung tumor motion was analyzed with and without audio coaching. RESULTS: The mean SI tumor displacement was 10.4 mm without audio coaching and increased to 23.0 mm with audio coaching (p < .01). The correlation coefficients ranged from 0.89 to 0.97 with free breathing. Applying audio coaching, the correlation coefficients improved significantly (range, 0.93-0.99; p < .01), and the SI lung tumor position mismatches became larger in 75% of all sessions. CONCLUSION: Audio coaching served to increase the degree of correlation and make it more reproducible. In addition, the phase shifts between tumor motion and abdominal displacement were improved; however, all patients breathed more deeply, and the SI lung tumor position mismatches became slightly larger with audio coaching than without audio coaching.
Author information
Author/s: Nakamura, Mitsuhiro (M); Narita, Yuichiro (Y); Matsuo, Yukinori (Y); Narabayashi, Masaru (M); Nakata, Manabu (M); Sawada, Akira (A); Mizowaki, Takashi (T); Nagata, Yasushi (Y); Hiraoka, Masahiro (M);
Affiliation: Department of Radiation Oncology and Image-applied Therapy, Kyoto University Graduate School of Medicine, Kyoto, Japan. m_nkmr(-atsign-)kuhp.kyoto-u.ac.jp
Journal and publication information
Publication Type: Evaluation Studies; Journal Article; Research Support, Non-U.S. Gov't
Journal: International journal of radiation oncology, biology, physics (Int J Radiat Oncol Biol Phys), published in United States. (Language: eng)
Reference: 2009-Oct; vol 75 (issue 2) : pp 558-63
Dates: Created 2009/09/08; Completed 2009/09/21;
PMID: 19735881, status: MEDLINE (last retrieval date: 9/21/2009, IMS Date: )
Sourced from the National Library of Medicine. Abstract text and other information may be subject to copyright.
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