Purpose: To evaluate the use of deep inspiration breath hold (DIBH) during tangential breast
radiation therapy as a means of reducing irradiated cardiac volume. Methods and Materials:
The Active Breathing Control (ABC) device designed at William Beaumont Hospital,
Michigan was used to quantify the potential benefit of radiation delivery during DIBH for five
left-sided breast cancer patients. This device initiates a breath hold at a predefined,
reproducible lung volume. For each patient, two CT scans were acquired with and without …