SU-E-T-481: Treatment Plans of Brain Metastasis with Cutting Edge Radiation Therapy Techniques: A Dosimetric Comparison Study of 3D Conformational Radiotherapy, Intensity Modulation Radiation Therapy, Dynamic Stereotactic Radiation Therapy and Contrast-En

2013 ◽  
Vol 40 (6Part18) ◽  
pp. 316-316
Author(s):  
A Tessier ◽  
M Vautrin ◽  
M Benkebil ◽  
J Adam
Keyword(s):  
Radiation Therapy ◽  
Brain Metastasis ◽  
Intensity Modulation ◽  
Cutting Edge ◽  
Stereotactic Radiation Therapy ◽  
Comparison Study ◽  
Stereotactic Radiation ◽  
Dosimetric Comparison ◽  
Edge Radiation ◽  
Treatment Plans

RADT-07. DETERMINATION OF THE OPTIMAL TIME INTERVAL BETWEEN POST-OPERATIVE MRI AND CT SIMULATION FOR STEREOTACTIC RADIOSURGERY PLANNING

2021 ◽  
Vol 23 (Supplement_6) ◽  
pp. vi42-vi42
Author(s):  
Drishti Panse ◽  
Aubrey Rogers ◽  
Edward Farhangi ◽  
Maria Péris-Celda ◽  
Khaled Adil
Keyword(s):  
Radiation Therapy ◽  
Brain Metastasis ◽  
Stereotactic Radiosurgery ◽  
Optimal Time ◽  
Time Interval ◽  
Stereotactic Radiation Therapy ◽  
Average Volume ◽  
Stereotactic Radiation ◽  
Ct Simulation ◽  
Planning Ct

Abstract BACKGROUND The incidence of brain metastasis is approximately 200,000 worldwide annually. Stereotactic radiation therapy of post-operative cavity reduces local recurrence. Surgical cavity size changes significantly with 96.5% demonstrating volumetric change during post-operative period. We sought to define the optimal time interval that preserved the volumetric dimensions between the post-surgical MRI and the CT simulation used for stereotactic radiosurgery planning. METHODS Seven patients with brain metastasis that underwent surgical resection and stereotactic radiation treatment at Albany Medical Center from February 2019 to April 2020 were included in the study. A total of 8 target lesions were included. Brain lab planning system was used for contouring the target volume. A postoperative MRI within 24-48 hours after surgery was obtained. 3 patients required an additional interim MRI 16-50 days after surgery. The planning CT simulation was performed 2 days prior and up to 15 days after the post-operative/interim MRI and target volumes were compared. RESULTS The average volume of the post-surgical cavity contoured by the neurosurgeons on the post-operative/interim MRI was 15.96 cc (± 7.79 cc, range of 6.54 -24.9 cc). The average volume of the post-surgical cavity contoured by the radiation oncologists on the planning CT was 15.71 (± 7.49 cc, range of 6.53 -24.31 cc). There was no noticeable change in volume size between post-operative/interim MRI and planning CT up to the period of 15 days. LIMITATION This was a retrospective pilot study with a small sample size and patients recruited from a single center. CONCLUSION There is no change in size of the cavity volume for up to 15 days between post-operative/interim MRI and planning CT. This knowledge will help understand the optimal time interval between post-operative MRI and CT simulation for the stereotactic radiation therapy planning.

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