The Effect of Contrast Media on Treatment Planning and Dose Calculation in Radiation Therapy of Pelvis Cancers
Background: Using contrast media is very important in diagnosis and identification of organ from the surrounding tissue. Contrast media can alter radiation absorption of studied organs following by enhanced image contrast. This study aimed to assess the influence of contrast media on treatment plann...
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| Format: | Article |
| Language: | fas |
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Isfahan University of Medical Sciences
2017-02-01
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| Series: | مجله دانشکده پزشکی اصفهان |
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| Online Access: | http://jims.mui.ac.ir/index.php/jims/article/view/7074 |
| _version_ | 1797719357903601664 |
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| author | Daryoush Shahbazi-Gahrouei Behzad Changizi Ali Jomehzadeh Mohammad Hassan Larizadeh |
| author_facet | Daryoush Shahbazi-Gahrouei Behzad Changizi Ali Jomehzadeh Mohammad Hassan Larizadeh |
| author_sort | Daryoush Shahbazi-Gahrouei |
| collection | DOAJ |
| description | Background: Using contrast media is very important in diagnosis and identification of organ from the surrounding tissue. Contrast media can alter radiation absorption of studied organs following by enhanced image contrast. This study aimed to assess the influence of contrast media on treatment planning and dose calculation in radiation therapy of pelvic cancers.
Methods: Six patients with pelvic area cancer with two sets of computed tomography (CT) images, one with contrast media and another without it, were studied and the effects of contrast media were studied.
Findings: After using contrast media, an increase of 2.91% in monitor unit (MU) for right lateral (RL) field and decreases of 0.59%, 0.75%, and 1.47% in monitor unit anterior-posterior (AP), posterior-anterior (PA), and left lateral (LL) fields was obtained in rectum cancer, respectively. For bladder cancer, a decrease of 0.34% in monitor unit for AP filed and increases of 1.57%, 0.46%, and 0.39% in monitor unit for PA, RL and LL fields was calculated, respectively. For cervix cancer, a decrease of 1.1% for AP field and an increase of 0.68% for PA field were obtained.
Conclusion: Regarding dose-volume histograms (DVHs) and calculated monitor units, the results showed that the dose differences between the plans for the CT images with and without contrast media were less than 1%. Of course to ensure the effect of contrast media on the amount of delivered dose to the target organ, study on more patients is recommended. |
| first_indexed | 2024-03-12T09:03:37Z |
| format | Article |
| id | doaj.art-60a05223f60346349aefe8aaa2e5fcf4 |
| institution | Directory Open Access Journal |
| issn | 1027-7595 1735-854X |
| language | fas |
| last_indexed | 2024-03-12T09:03:37Z |
| publishDate | 2017-02-01 |
| publisher | Isfahan University of Medical Sciences |
| record_format | Article |
| series | مجله دانشکده پزشکی اصفهان |
| spelling | doaj.art-60a05223f60346349aefe8aaa2e5fcf42023-09-02T15:28:58ZfasIsfahan University of Medical Sciencesمجله دانشکده پزشکی اصفهان1027-75951735-854X2017-02-0134408138913942370The Effect of Contrast Media on Treatment Planning and Dose Calculation in Radiation Therapy of Pelvis CancersDaryoush Shahbazi-Gahrouei0Behzad Changizi1Ali Jomehzadeh2Mohammad Hassan Larizadeh3Professor, Department of Medical Physics, School of Medicine, Isfahan University of Medical Sciences, Isfahan, IranMSc Student, Department of Medical Physics, School of Medicine, Isfahan University of Medical Sciences, Isfahan, IranAssistant Professor, Department of Medical Physics, School of Medicine, Kerman University of Medical Sciences, Kerman, IranOncology-Radiation Therapist, Shafa Hospital, Kerman, IranBackground: Using contrast media is very important in diagnosis and identification of organ from the surrounding tissue. Contrast media can alter radiation absorption of studied organs following by enhanced image contrast. This study aimed to assess the influence of contrast media on treatment planning and dose calculation in radiation therapy of pelvic cancers. Methods: Six patients with pelvic area cancer with two sets of computed tomography (CT) images, one with contrast media and another without it, were studied and the effects of contrast media were studied. Findings: After using contrast media, an increase of 2.91% in monitor unit (MU) for right lateral (RL) field and decreases of 0.59%, 0.75%, and 1.47% in monitor unit anterior-posterior (AP), posterior-anterior (PA), and left lateral (LL) fields was obtained in rectum cancer, respectively. For bladder cancer, a decrease of 0.34% in monitor unit for AP filed and increases of 1.57%, 0.46%, and 0.39% in monitor unit for PA, RL and LL fields was calculated, respectively. For cervix cancer, a decrease of 1.1% for AP field and an increase of 0.68% for PA field were obtained. Conclusion: Regarding dose-volume histograms (DVHs) and calculated monitor units, the results showed that the dose differences between the plans for the CT images with and without contrast media were less than 1%. Of course to ensure the effect of contrast media on the amount of delivered dose to the target organ, study on more patients is recommended.http://jims.mui.ac.ir/index.php/jims/article/view/7074Contrast mediaTreatment planning systemRadiotherapyPelvis cancer |
| spellingShingle | Daryoush Shahbazi-Gahrouei Behzad Changizi Ali Jomehzadeh Mohammad Hassan Larizadeh The Effect of Contrast Media on Treatment Planning and Dose Calculation in Radiation Therapy of Pelvis Cancers مجله دانشکده پزشکی اصفهان Contrast media Treatment planning system Radiotherapy Pelvis cancer |
| title | The Effect of Contrast Media on Treatment Planning and Dose Calculation in Radiation Therapy of Pelvis Cancers |
| title_full | The Effect of Contrast Media on Treatment Planning and Dose Calculation in Radiation Therapy of Pelvis Cancers |
| title_fullStr | The Effect of Contrast Media on Treatment Planning and Dose Calculation in Radiation Therapy of Pelvis Cancers |
| title_full_unstemmed | The Effect of Contrast Media on Treatment Planning and Dose Calculation in Radiation Therapy of Pelvis Cancers |
| title_short | The Effect of Contrast Media on Treatment Planning and Dose Calculation in Radiation Therapy of Pelvis Cancers |
| title_sort | effect of contrast media on treatment planning and dose calculation in radiation therapy of pelvis cancers |
| topic | Contrast media Treatment planning system Radiotherapy Pelvis cancer |
| url | http://jims.mui.ac.ir/index.php/jims/article/view/7074 |
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