v) A novel beam-steering leaky-wave antenna that uses reactive loading capacitors along the leaky line is presented. The reactive loading varies the phase constant of the leaky line, altering direction of the main beam. A prototype was constructed and tested, demonstrating that a beam scanning angle of 23” is obtained by periodically loading the 0.06527 pF capacitors along the leaky line at 4 G...

Brachytherapy is not widely used in Sweden to treat localized prostate cancer. This treatment method has been available for some time, but recent advancements in technology are leading to increased utilization. Findings from isolated, uncontrolled studies of high dose rate brachytherapy in combination with external beam radiotherapy suggest some improvement in treatment outcomes. However, prosp...

PURPOSE To investigate the possibility of using a single spot scanning proton beam to treat superficial lesions. METHODS A cylindrical phantom with a simulated superficial target (it seated 0.5-4cm depth from the surface, volume: 270cm3 ) was created in Eclipse treatment planning system. Three proton plans were generated: (a) a single AP uniform scanning beam with aperture and range compensat...

Beam-scanning antennas are attractive for high-bit-rate data communication systems and high resolution sensing systems in millimeter-wave band. Waveguide antenna is one of the most attractive antennas for such millimeter-wave systems because of its low loss and high efficiency characteristics in high frequency band. Horizontally-beam-scanning antennas such as phased arrays and DBF (Digital Beam...

We consider topology based criteria for the selection of optimal beam orientations for conformal external radiotherapy. The advantage of such an approach is that computation time is considerably reduced since no dose calculation is required. The algorithm preclassifies all possible irradiation directions by assigning to each a fitness measure, the geometry fitness factor (GFF). This factor is a...

Abstract This article describes the updated GSI radiotherapy research facility (Cave M) located at Helmholtz Center for Heavy Ion Research in Darmstadt, Germany. was upgraded by modernizing beamline that supported a pilot project carbon ion cancer therapy Europe from 1997 to 2008. Descriptions are provided of modernized beamline, related hardware components and treatment delivery system. The pe...

PURPOSE This randomized, prospective study assesses the impact of postoperative external-beam radiation therapy on local recurrence (LR), overall survival (OS), and quality of life after limb-sparing resection of extremity sarcomas. PATIENTS AND METHODS Patients with extremity tumors and a limb-sparing surgical option were randomized to receive or not receive postoperative adjuvant external-b...

Background: This study evaluates the dose distribution of the wedged tangential beam three-dimensionally planned conformal radiotherapy (3D-CRT) compared to the previously used (5 years ago) two-dimensionally (2D-RT) planned radiotherapy of the chest wall for postmastectomy breast cancer patients in Clinical Oncology and Nuclear Medicine Department, Mansoura University. Patients and Methods: Th...