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Updated: Sep 30, 2026

Voluntary Breath-hold Technique for Reducing Heart Dose in Left Breast Radiotherapy
Published on: July 3, 2014
[Development of picture and voice gated intermittent irradiation system connected without linear accelerator for
Tokuzou Yokokawa1, Hiroshi Shintani
1Department of Radiology, Teikyo University School of Medicine.
Abstract:
In patients with lung cancer of the lower lobes and liver cancer, treatment volume including respiratory motion is an important therapeutic problem. We developed a voluntary breath-hold system using pictures and voice messages so as to reduce the excessive safety margin that covers respiratory motion. The system consists of two sets of monitor and speaker, and a computer and software for control without direct connection to a linear accelerator. When the patient repeatedly holds his or her breath in response to a picture and voice message, irradiation is manually performed and then proceeds intermittently. Although safety problems remain to be solved because of off-line, synchronized irradiation with our system is simple, inexpensive, and could be widely used. It also would be expected to reduce the tumor target volume around the diaphragm.
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