Dosimetry Data Requested
Please send the following dosimetry data via email at your earliest convenience to the physicist performing the site visit, or to [email protected].
I. COMPLETED FORMS (blank forms attached are also available at http://IROCHouston.mdanderson.org):
Along with the IROC Houston forms for the following items, please include copies of the indicated documents.
Instrumentation: Calibration certificates (Ion chambers & Electrometers) Photons: Most recent yearly output calibration (various factors & calculations) Electrons: Most recent yearly output calibration (various factors & calculations) Brachytherapy: Source-strength certificates
II. PHOTONS:
Generate plans from your treatment planning system (TPS) for a 45cm x 45cm x 45cm water phantom. For each of the following setups, obtain MU and point-doses.
Create a copy of the excel sheet ”photon beam data form.xls” for each photon beam in clinical operation. Fill out and email Tables 1-4 for each photon beam to the physicist site visiting your facility or to [email protected], prior to the site visit. Please retain and submit hard copies of the plans during the site-visit.
a) PDD & Output Factors: Generate plans to fill in Table 1.
b) Wedge Transmission: Generate plans to fill in Table 2, for clinical and frequently used wedges (eg. lower, upper, EDW, virtual, etc.). If multiple types of wedges are used clinically, then complete Table 2 for each type.
d) Profile data at dmax: Off center ratio (OCR) for the largest field size and fill in Table 3.
e) Small field-size output factors: Generate plans to fill in Table 4. For Varian machines, use MLC to generate these field sizes while maintaining the secondary jaws at a 10 cm x 10 cm.
Please also have the dosimetry data book on hand for the site visit, including Wedge/Tray factors, tables of %DD, TMR & Output factors.
D:\Docs\2017-12-16\090d619743c46c5bebe7783dd8770064.doc III. ELECTRONS: For the cadre of elelctron beams, create a copy of the excel sheet “electron beam data form.xls” for each accelerator with electrons in clinical operation. Fill out and email Table 5 for each accelerator to the physicist site visiting your facility or to [email protected], prior to the site visit. For b) through d), please have the data on hand at time of site visit.
a) Fill out table 5, providing depths for 80% and 50% dose as well as Imax.
b) Cone ratios (output factors) for nominal and extended SSDs
c) PDD (NOT ionization) for standard SSD & standard Cone Size: tabular data.
Include depth of output calib. (where clinical output is 1.000 cGy/mu)
d) Dose calculation technique for extended SSD = 110 cm
(if use VSD, please include table of VSD values)
IV. BENCHMARK CASES The benchmark cases can be downloaded from the IROC Houston’s website (http://IROCHouston.mdanderson.org). On the top bar there is a hot button labeled “on-site audits”. Under this you will find a link to the benchmark cases. There are four cases; Brain, Breast, Cranial- Spinal and Mantle. Please plan all 4 cases following the directions which are posted on the website. Please submit the treatment plan electronically to the ITC at http://atc.wustl.edu, as well as forward a color hardcopy or electronic version of the data to the IROC Houston at:
Electronic address: [email protected]
Mailing address: UTMD Anderson Cancer Center IROC Houston QA Center Attn: Dosimetry 8060 El Rio St Houston, TX 77054
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