Medical Physics Seminar - Monday, October 5, 2009

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Image Quality Improvement and Imaging Dose Management in Megavoltage Cone Beam CT

Ryan Flynn, Ph.D.

Clinical Assistant Professor

Department of Radiation Oncology

Univesity of Iowa Hospitals and Clinics

Iowa City, Iowa

Megavoltage cone beam computed tomography (MVCBCT) images are acquired for patient positioning in radiotherapy with a beam generated by the treatment linac and the same flat panel imager used for portal imaging.  The quality of MVCBCT images acquired with the treatment beam line (TBL) at a given imaging dose are inferior to those of kilovoltage cone beam CT (kVCBCT) largely because the detector response is more optimal at keV than MeV x-ray energy ranges.  In this talk improvements in MVCBCT technology will be discussed, including the use of an imaging beam line (IBL), which uses a carbon, rather than tungsten, electron target to generate multiple orders of magnitude more keV-range x-rays than the TBL, as well as an ultrafast ceramic scintillator (UFCS) detector system, which improves x-ray detection efficiency.  Clinically implemented methods for accounting for IBL-based MVCBCT imaging dose, which is greater than the typical kVCBCT imaging dose, will also be discussed.

Location: 1345 Health Sciences Learning Center (HSLC)

Time:  4:00pm-5:00pm

Refreshments will be provided prior to the talk

QUICK LINKS: [Medical Physics Home Page] [Seminar Home Page]