open access

Vol 11, No 1 (2006)
Published online: 2006-01-01
Submitted: 2005-02-14
Get Citation

Portal image contrast enhancement

Alireza Shirazi, Seied Rabie Mahdavi, Dariush Sardari, Lida Sadri
DOI: 10.1016/S1507-1367(06)71046-X
·
Rep Pract Oncol Radiother 2006;11(1):23-28.

open access

Vol 11, No 1 (2006)
Published online: 2006-01-01
Submitted: 2005-02-14

Abstract

Aim

The delivery of radiation doses to the target volume, while minimizing the dose delivered to normal tissues, is the main objective in radiotherapy. The intention in our study was to enhance the contrast of portal images, in order to increase the accuracy of delineation of the organs in the irradiated field.

Materials/Methods

Software was written, based on local enhancements to the pixel values in the image matrix. Portal images were digitized by CCD and stored in a format compatible with this program.

We applied this program, as an m-file in a MATLAB imaging tool box, to the matrices of the portal images. The imaging parameters, before and after application of the program, were compared.

Results

Quantitative information was obtained from images. Analysis of the means, and standard deviations, of these data showed that the differences between criteria in the two groups of images were significant (p<0.01). In the case of the qualitative analysis, final images scores were based on “special weight”. The result of this test confirmed the superior quality of the post-processed images, from the professional point of view.

Conclusion

The superior final images, as judged by experts using three studied parameters (superiority of lung images, superior images of the thorax and its soft tissue), can be used to increase the accuracy of the treatment set up and therefore decrease the likelihood of complications in the normal tissues.

Abstract

Aim

The delivery of radiation doses to the target volume, while minimizing the dose delivered to normal tissues, is the main objective in radiotherapy. The intention in our study was to enhance the contrast of portal images, in order to increase the accuracy of delineation of the organs in the irradiated field.

Materials/Methods

Software was written, based on local enhancements to the pixel values in the image matrix. Portal images were digitized by CCD and stored in a format compatible with this program.

We applied this program, as an m-file in a MATLAB imaging tool box, to the matrices of the portal images. The imaging parameters, before and after application of the program, were compared.

Results

Quantitative information was obtained from images. Analysis of the means, and standard deviations, of these data showed that the differences between criteria in the two groups of images were significant (p<0.01). In the case of the qualitative analysis, final images scores were based on “special weight”. The result of this test confirmed the superior quality of the post-processed images, from the professional point of view.

Conclusion

The superior final images, as judged by experts using three studied parameters (superiority of lung images, superior images of the thorax and its soft tissue), can be used to increase the accuracy of the treatment set up and therefore decrease the likelihood of complications in the normal tissues.

Get Citation

Keywords

Contrast enhancement; Radiotherapy; Portal imaging; MATLAB; Imaging tool box

About this article
Title

Portal image contrast enhancement

Journal

Reports of Practical Oncology and Radiotherapy

Issue

Vol 11, No 1 (2006)

Pages

23-28

Published online

2006-01-01

DOI

10.1016/S1507-1367(06)71046-X

Bibliographic record

Rep Pract Oncol Radiother 2006;11(1):23-28.

Keywords

Contrast enhancement
Radiotherapy
Portal imaging
MATLAB
Imaging tool box

Authors

Alireza Shirazi
Seied Rabie Mahdavi
Dariush Sardari
Lida Sadri

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