Small computer assisted analysis of camera renograms Page: 1 of 13
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SMALL COMPUTER ASSISTED ANALYSIS OF CAMERA RENOGRAMiS
P.D. Esser, P.R. Bradley-Moore, H.L. Atkins,
J.S. Robertson, and A.N. Ansari
Many clinical advantages arise from the use of a small dedicated
computer system interfaced with a scintillation camera. For example, the
computer can be programmed for the repetitive execution of complex protocols,
and scintiscans can be stored and retrieved from magnetic tape or disc.
This is particularly useful in storing information during dynamic studies for
analysis. While each of these uses is important, an area of increasing
significance is the use of the computer to assist in analyses of patient
studies, analyses that require lengthy mathematical handling as in the reno-
gram program discussed below.
The presence of a digital computer located in a clinical facility avoids
many of the problems associated with using a large computer at some remote
location. There is no transporting and transposing of data and often the
analysis of a study can be completed shortly after acquisition of the data.
In addition, conversational language for small machines can be used with a
minimum of training by the clinical personnel and program changes can be
rapidly implemented and tested.
The disadvantages of small computers are well known. For example,
they usually have a small memory capacity and are slower than large computers.
These features impose some restrictions on the complexity of problems that
can be easily programmed.
In this article the usefulness and convenience of a small computer-
anger camera system is demonstrated by means of a renal function analysis
program written for this system. The program is based on CABBS,
Computer-Assisted Blood Background Subtraction, written by Britton & Brown
and programmed for a CDC-6600, a large computer system (1) for data
acquired with 3 probes. This type of renal function analysis is an example
of the many programs that may be utilized by departments that do not have
access to a large computer. The following discussion is devoted to the Small
Computer-Assisted Analysis of Renograms (SCAAR) starting with comments on
blood background subtraction.
BLOOD BACKGROUND SUBTRACTION
Use of blood background subtraction is an important advantage of this
program because it can improve diagnostic accuracy, particularly in the case
of a poorly-functioning kidney. For instance, we anticipate that cases of
poor renal function due to obstruction can be separated from cases of
parenchymal disease causing poor renal function with no obstruction. This
differentiation is difficult to make without blood background subtraction.
Progressively, the scintillation camera has become the instrument of choice
for renography, but background subtraction has only occasionally (6) been
applied. However, the choice of a suitable area for the determination of
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Esser, P.D.; Bradley-Moore, P.R.; Atkins, H.L.; Robertson, J.S. & Ansari, A.N. Small computer assisted analysis of camera renograms, article, January 1, 1972; Upton, New York. (https://digital.library.unt.edu/ark:/67531/metadc1027737/m1/1/: accessed March 20, 2019), University of North Texas Libraries, Digital Library, https://digital.library.unt.edu; crediting UNT Libraries Government Documents Department.