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Radiology, Vol 122, 505-509, Copyright © 1977 by Radiological Society of North America

ARTICLES

Radiation tolerance of the rat spinal cord: time-dose relationships

AJ van der Kogel

The cervical or lumbosacral region of the rat spinal cord was irradiated with 300-kV x rays. Syndromes of radiation myelopathy similar to those in man were observed in rats. Iso-effect curves for tolerance in relation to the number of fractions at daily intervals have a slope of 0.44 and 0.42 on a log-log scale for the cervical and lumbosacral regions, respectively. With intervals of up to 7 days, no significant further increase in tolerance was observed. Low dose rate treatments indicate a half-time of 1.5 hr. for repair of subeffective damage. These results suggest that tolerance of the spinal cord depends very strongly on the number of fractions given and only to a small extent on the overall time of treatment.




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RADIOLOGY RADIOGRAPHICS RSNA JOURNALS ONLINE
Copyright © 1977 by the Radiological Society of North America.