| Title: |
COMPUTER-FOCUSING FOR AREA SCANS |
| Authors: |
T Nagai; T A Linuma; S Koda |
| Contributors: |
The Pennsylvania State University CiteSeerX Archives |
| Source: |
http://jnm.snmjournals.org/content/9/10/507.full.pdf. |
| Collection: |
CiteSeerX |
| Description: |
Scintillation area scanning is a relatively new diag nostic method in clinical medicine and its use has progressed rapidly over the years. Because the method is used to visualize the spatial distribution of radioactivity in internal organs, one would like to be able to detect and display the smallest possible lesions. Many methods using a wide range of in struments and radiopharmaceuticals have been advo cated to increase the resolving power of the scanner. At the present time, however, the resolution of area scanners is not sufficiently sharp. A multichan nel focusing collimator consisting of a honeycomb of hexagonal holes is usually used, but even with this focusing collimator the region of response is broad and has a circular cross section at the focal distance. The sensitivity in scanning must also be increased, but at present this can be achieved only by sacrificing spatial resolution. In a previous paper (/) we reported that a correc tion method based on iterative approximation which had been used to correct distortion in beta and gamma spectra (2) could be used to extract true information from the observed data; with this method corrected profiles obtained with a wholebody linear scanner showed a more detailed struc ture than did the original. We felt that a similar correction method could be used in the image of area scans. At present a wide variety of analog techniques are used to record area-scanning data. These analog techniques, however, appear to offer less accurate recording and result in a loss of information. More over, they are not adaptable to computer analysis. To use digital-computer processing, it is necessary to use digital recording in which all original information in an unmodified form is collected and recorded as an array of actual numbers. The purpose of this paper is to show how digital information suitable for computer processing can be used and how more information can be obtained from computer-corrected area scans than from the original digital scan or conventional analog data ... |
| Document Type: |
text |
| File Description: |
application/pdf |
| Language: |
English |
| Relation: |
http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.1035.9627; http://jnm.snmjournals.org/content/9/10/507.full.pdf |
| Availability: |
http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.1035.9627; http://jnm.snmjournals.org/content/9/10/507.full.pdf |
| Rights: |
Metadata may be used without restrictions as long as the oai identifier remains attached to it. |
| Accession Number: |
edsbas.F898CDF8 |
| Database: |
BASE |