and Virginia Hospital Center

Lanham, United States

and Virginia Hospital Center

Lanham, United States

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PubMed | and Virginia Hospital Center
Type: Journal Article | Journal: Medical physics | Year: 2017

The Iris 2 dodecahedral collimator in the CyberKnife unit can demonstrate visible asymmetry in the shaped radiation field, as seen on routine films. Specifically some edges of the collimator project longer than others. PDDs and output factors remain unaffected by this asymmetry. An in-house program was written to analyze the impact of this asymmetry on profiles.Two years of routine chromodynamic films were retrospectively analyzed using an in-house developed program. Films were obtained on a weekly basis in a plastic phantom on the vendor-provided mount. Profiles were obtained every degree. A dodecahedron was fitted to the 50% isodose line and the positions and sizes of the upper and lower hexagonal collimators were derived. The collimators profiles at every degree, symmetry and centering were calculated and trended over the months.Asymmetries in the obtained profiles were apparent. The upper and lower collimators were off-centered (0.31 mm, p<10-8), they did not project the same field size at 80 cm (0.46 mm difference, p<10-31). Profiles as a function of angle demonstrate a periodicity, but short and long profiles are rarely 15 apart, but vary from 9 to 21. In addition, a second, intermediate minimum is seen at every other short profile. A trend in the field size over time is noted and can be monitored to identify servicing needs.Despite its differences, the asymmetric Iris 2 collimator did not demonstrate large deviations in PDDs and output factors. Due to the asymmetry, the 15 apart profiles obtained at commissioning do not represent the true large and short blade profiles of the collimator. Averaging of the profiles in the commissioning process hides this difference.


BETHESDA, Md., Nov. 16, 2016 (GLOBE NEWSWIRE) -- The twelfth annual EagleBank Foundation Fight Against Breast Cancer Golf Classic and First Annual Tennis Classic, held on October 10, 2016, at the Woodmont Country Club, raised over $400,000--our most successful fundraiser yet.  Proceeds from this event continue to support research and outreach programs through partnerships with the following local hospitals and organizations: Shady Grove Adventist Hospital and Suburban Hospital in Montgomery County, MD, Providence Hospital and Washington Hospital Center in Washington, DC, and Virginia Hospital Center in Arlington, VA.  Other beneficiaries include The Children’s Inn at The National Institutes of Health, the Primary Care Coalition of Montgomery County, Lolly’s Locks, Hope Connections for Cancer Support, and The Breast Cancer Research Foundation.  Since the first golf tournament in 2005, the Foundation has raised over $3 million for the benefit of local area hospitals and organizations in their fight against breast cancer.  These funds have enabled local hospitals and other cancer-focused organizations in our community to continue ongoing research and provide support services—all dedicated to putting an end to breast cancer. “As Chairman of the EagleBank Foundation, I would like to thank all of our players, donors, sponsors, volunteers and friends for their generous contribution to making this year's EagleBank Golf Tournament and First Annual Tennis Classic for the fight against breast cancer a tremendous success,” commented Don Rogers (of Shulman Rogers), a Director of EagleBank.  “It was a sell-out event that raised more than $400,000 that will be distributed to cancer programs at area hospitals and to local organizations who provide needed services to breast cancer survivors.  Breast cancer touches nearly everyone.  We all know someone who has been affected by this disease, in fact, one out of eight women and more than 2,600 men each year.  We are hopeful that our efforts will play a role in the prevention and help find a quicker path to a cure for breast cancer in our lifetime.” “Raising public awareness for breast cancer is so critical, as more and more women each day are diagnosed with the disease,” commented EagleBank’s Chairman and CEO Ron Paul.  “As a local, business bank and good corporate citizen, it is extremely important to us to focus on this mission to raise funds for the many worthy cancer treatment and research facilities in our community who are making a big difference in the lives of cancer patients.  Our golf tournament is one of the ways that we give back to our community.  Because of the generous donations of individuals and corporations for these past 12 years—and the passion and hard work of our Committee members and everyone else involved in organizing this tournament—we have been able to raise substantial funds to help fight the devastating effects that breast cancer has on all who are touched by it.  We are thankful to everyone for their continued support of our efforts to save more lives and help with this critical fight.” About Eagle Bancorp, Inc. and EagleBank Eagle Bancorp, Inc. is the holding company for EagleBank, which commenced operations in 1998. EagleBank is headquartered in Bethesda, Maryland, and conducts full service commercial banking through 21 offices, located in Montgomery County, Maryland, Washington, D.C. and Northern Virginia. EagleBank focuses on building relationships with businesses, professionals and individuals in its marketplace.

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