Florida Cancer Specialists Largo

Largo, United States

Florida Cancer Specialists Largo

Largo, United States
SEARCH FILTERS
Time filter
Source Type

PubMed | Florida Cancer Specialists New Port Richey, Florida Cancer Specialists Largo, Florida Cancer Specialist New Port Richey, Florida Cancer Specialists Tampa and Florida Cancer Specialist Brooksville
Type: Journal Article | Journal: Medical physics | Year: 2017

To determine if the photon beams associated with several models of accelerators are matched with Golden Beam data (VGBD) to assess treatment planning modeling and delivery.Six accelerators photon beams were evaluated to determine if they matched the manufacturers (Varian Medical Systems, Inc.) VGBD. Additional direct comparisons of the 6X and 18X beams using the manufacturers specification of Basic and Fine beam matching were also performed. The Cseries accelerator models were 21 EX (3), IX (2), and a IX Trilogy, ranging from three to twelve years post installation. Computerized beam scanning was performed (IBA Blue Phantom 2) with 2 CC13 ion chambers in water at 100 cm SSD. Dmax (10 cm2 field size), percentage depth dose (6 cm2, 10 cm2, 20 cm2, and 30 cm2 field sizes) and beam uniformity (10 cm2, 30 cm2 and 40 cm2 field sizes) were evaluated.When comparing the beams with VGBD using the Basic matching criteria, all beams were within the specifications (1.5mm at dmax, 1% PDD, and 2% Profiles). When considering the Fine matching criteria (1.5mm at dmax, 0.5% PDD, and 2% Profiles), only three of six 6MV beams and two of six high energy (five 18MV & one 15MV) beams passed. Direct comparisons between accelerators using the Clinac IX (installed 2012) as the reference beam datasets resulted in all 6 MV and 18MV beams meeting both the Basic and Fine criterion with the exception of two accelerators.Linear accelerators installed up to nine years apart are capable of meeting the manufacturers beam matching criteria for Basic matching. Without any adjustments most beams, when evaluated, may meet the Fine match criteria. The use of a single dataset (VGBD or designated accelerator reference data) for treatment planning commissioning is acceptable and can provide quality treatment delivery.


PubMed | Florida Cancer Specialists Largo and Florida Cancer Specialists New Port Richey
Type: Journal Article | Journal: Medical physics | Year: 2017

To implement a MLC accelerator based SRS program using small fields down to 1 cm 1 cm and to determine the smallest target size safe for clinical treatment.Computerized beam scanning was performed in water using a diode detector and a linac-head attached transmission ion chamber to characterize the small field dosimetric aspects of a 6 MV photon beam (Trilogy-Varian Medical Systems, Inc.). The output factors, PDD and profiles of field sizes 1, 2, 3, 4, and 10 cmThe new TPS model was validated by using a tolerance criteria of 2% dose and 2 mm distance to agreement. For fields 3 cmEnd to end testing confirmed that MLC defined SRS for target sizes 1.0 cm can be safely planned and delivered.

Loading Florida Cancer Specialists Largo collaborators
Loading Florida Cancer Specialists Largo collaborators