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Radiology, Vol 126, 239-242, Copyright © 1978 by Radiological Society of North America

ARTICLES

Spinal cord protection during cross-fire irradiation of the intrathoracic esophagus: tube-tilt vs. Shielding

W Swechand, TK Jones Jr, FM Khan and SH Levitt

The protection of the upper thoracic spine achieved by a tube-tilt technique was found to be comparable to that obtained from direct shielding during cross-fire therapy of the intrathoracic esophagus. An isocentric technique was utilized which included one anterior and two posterior-oblique fields. Significant underdosages to the esophagus at levels superior to the isocenter are caused by tube-tilt, whereas direct shielding resulted in a uniformity of esophageal doses to within 5%. The need for a tissue compensator for the anterior field must be assessed on an individual basis from off-axis treatment planning.




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