Uncertainties in CT-based radiation therapy treatment planning associated with patient breathing

JM Balter, RK Ten Haken, TS Lawrence, KL Lam… - International Journal of …, 1996 - Elsevier
Purpose: To evaluate uncertainties associated with treatment-planning computed
tomography (CT) data obtained with the patient breathing freely. Methods and Materials:
Patients with thoracic or abdominal tumors underwent a standard treatment-planning CT
study while breathing quitely and freely, followedy CT scans while holding their breath at
normal inhalation and normal exhalation. Identifical treatment plans on all three CT data sets
for each patient pointed out differences in:(a) radiation path lengths;(b) positions of the …
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