dosimetric comparison of two craniospinal radiotherapy techniques for treatment optimization

Authors

hamidreza baghani ph.d. student, radiation-medicine dept., nuclear engineering faculty, shahid beheshti university, tehran, iran

seyed mahmoodreza aghamiri associate professor, radiation-medicine dept., nuclear engineering faculty, shahid beheshti university, tehran, iran

hossein gharaati associate professor, medical engineering and physics dept., medical faculty, medical science university of tehran, tehran, iran

seyed rabie mahdavi assistant professor, medical physics dept., medical faculty, medical science university of iran, tehran, iran

abstract

introduction: orthogonal radial fields are those in which the central axes are perpendicular to each other. an example of these orthogonal fields is the set of craniospinal orthogonal fields that are used for radiotherapy of medulloblastoma. craniospinal radial fields consist of two parallel-opposed fields for brain exposure and one or two posterior spinal fields for spinal cord exposure. the main problem in using these combinative fields is the overlap of radial fields, where they adjoin. therefore, adjusting radial fields in craniospinal radiotherapy is of remarkable significance and can outstandingly affect the reduction of the side effects due to radiotherapy. in doing so, two different setups were used for craniospinal radiotherapy, and by using dosimetry in each adjustment in the junction region between brain and upper spine fields and in organs at risk, the results of the two adjustments were compared. materials and methods: each one of these two setups was separately performed on a rando phantom. in the first setup, the arrangement of radial fields was performed without the rotation of the treatment bed and the collimators of the brain fields. in the second setup, the arrangement of radial fields was performed using the rotation of the treatment bed and the collimators of brain fields. for dosimetry, gr-200 tlds were used. for radiotherapy, a varian linac (2100 c/d model) was used. results: the results of dosimetry in the brain ctv, junction of brain and upper spine fields, thyroid and heart in the first setup were equal to 105, 168, 46 and 44 cgy, respectively, and in second setup, 106, 140, 48 and 44 cgy, respectively. absorbed dose to the testes in both setups was negligible.  discussion and conclusion: the results of dosimetry in both setups showed that angling the bed and the collimators for the brain fields prevents the overlap of radial fields and reduces the side effects due to radiotherapy.

Upgrade to premium to download articles

Sign up to access the full text

Already have an account?login

similar resources

Dosimetric Comparison of Two Craniospinal Radiotherapy Techniques for Treatment Optimization

Introduction: Orthogonal radial fields are those in which the central axes are perpendicular to each other. An example of these orthogonal fields is the set of craniospinal orthogonal fields that are used for radiotherapy of medulloblastoma. Craniospinal radial fields consist of two parallel-opposed fields for brain exposure and one or two posterior spinal fields for spinal cord exposure. The m...

full text

IMRT for Craniospinal Irradiation: A Dosimetric Comparison

Part of the Oncology Commons This Article is brought to you for free and open access by the Jefferson Digital Commons. The Jefferson Digital Commons is a service of Thomas Jefferson University's Center for Teaching and Learning (CTL). The Commons is a showcase for Jefferson books and journals, peer-reviewed scholarly publications, unique historical collections from the University archives, and ...

full text

Dosimetric Comparison and Evaluation of 4 Stereotactic Body Radiotherapy Techniques for the Treatment of Prostate Cancer

PURPOSE The aim of this study was to compare dosimetric characteristics, monitor unit, and delivery efficiency of 4 different stereotactic body radiotherapy techniques for the treatment of prostate cancer. METHODS This study included 8 patients with localized prostate cancer. Dosimetric assets of 4 delivery techniques for stereotactic body radiotherapy were evaluated: robotic CyberKnife, nonc...

full text

Dosimetric comparison of two different whole brain radiotherapy techniques in patients with brain metastases: How to decrease lens dose?

Background: Palliative whole brain radiotherapy (WBRT) has been the standard treatment for brain metastases. Ionizing radiation is known to be one of the most potent cataractogenic agents. We aimed to evaluate two different radiotherapy techniques with respect to the doses received by the organs at risk (OAR) in patients with brain metastasis who undergone WBRT. Materials and Methods: Ten conse...

full text

My Resources

Save resource for easier access later


Journal title:
iranian journal of medical physics

جلد ۷، شماره ۲، صفحات ۱-۸

Hosted on Doprax cloud platform doprax.com

copyright © 2015-2023