Definition of T in the NSD equation
- 1 March 1974
- journal article
- Published by Oxford University Press (OUP) in The British Journal of Radiology
- Vol. 47 (555) , 200-201
- https://doi.org/10.1259/0007-1285-47-555-200
Abstract
We have received several comments concerning the definition of the “overall treatment time” (T days) as used in our recent British Journal of Radiology article “A simplification in the use of the NSD concept in practical radiotherapy” (Orton and Ellis, 1973). It has been correctly observed that the value of T as used in our article is not identical to that defined originally (Winston, Ellis and Hall, 1969). Specifically, the time T for N fractions was previously defined as the interval between the first and Nth fractions, whereas we have defined T for N fractions as the “interval between the first and (N + l)th fractions”. For example, if five successive daily fractions are given, T=five days and not four as previously defined. Similarly, for a patient treated once weekly for ten weeks, T=70 days (and not 63).Keywords
This publication has 2 references indexed in Scilit:
- Grey scale echography in the diagnosis of intrahepatic diseaseJournal of Clinical Ultrasound, 1973
- Dose, time and fractionation: A clinical hypothesisClinical Radiology, 1969