HOME HELP FEEDBACK SUBSCRIPTIONS ARCHIVE SEARCH TABLE OF CONTENTS		QUICK SEARCH:   [advanced] Author: Keyword(s): Year:  Vol:  Page:

This Article Full Text (PDF) Alert me when this article is cited Alert me if a correction is posted Services Email this article to a friend Similar articles in this journal Similar articles in PubMed Alert me to new issues of the journal Download to citation manager Citing Articles Citing Articles via Google Scholar Google Scholar Articles by Brown, D. W. Search for Related Content PubMed PubMed Citation Articles by Brown, D. W.

Letter to the Editor

Departments of Radiology and Medicine, University of Colorado Medical Center, Denver, Colorado

ABSTRACT

The paper presents a set of simple and frequently useful equations for least squares analysis of a set of data points that fit a single exponential function is presented. They can be applied quickly using a calculator and table of logarithms without knowledge of advanced mathematics. We have found them useful in determining the half-time of disappearance and Y intercept which best fit the data in several tests performed routinely in nuclear medicine. Comparison reveals a surprising discrepancy between the half-times determined by this method and those obtained by semilogarithmic plotting. It is suggested that the least-squares method presented is more objective and probably superior.