background: making use of the orthovoltage machines in radiotherapy, is one of the routine methods for the treatment of the superficial lesions. in this study, an important determinant of x-ray quality, the hvl (half value layer), has been evaluated. materials and methods: the hvls of a orthovoltage x-ray machine in 120 and 180 kvp are measured, using an empirical method, in which the hvls are ...

OBJECTIVES/HYPOTHESIS Evaluation of treatment results of orthovoltage X-rays for a selection of previously untreated favorable basal cell carcinomas (BCC) in the head and neck area concerning local control, cosmetic and functional outcome, and toxicity profile. METHODS A consecutive series of patients with primarily treated BCCs who were irradiated by means of orthovoltage X-rays in the Nethe...

Background: Keloids are benign fibrous dermal tumors origina ng from skin injury a er surgery, piercing or others wounds. Materials and Methods: Sixty -two pa ents with keloids were treated postopera vely using orthovoltage irradia on. The total dose delivered was 12 Gy in three consecu ve days, 4Gy per frac on. Treatment started 24 h a er surgery. The median follow-up was 44.5 months. Results:...

PURPOSE To evaluate the role of in vivo dosimetry with radiochromic films for dose verification in cutaneous radiation therapy (RT). METHODS Five patients with 8 cutaneous or sub-cutaneous malignancies of the face, neck, trunk and extremity receiving RT were included. Orthovoltage, megavoltage photon therapies were applied based on anatomic location. The delivered dose for each target was mea...

Background: Making use of the orthovoltage machines in Radiotherapy, is one of the routine methods for the treatment of the superficial lesions. In this study, an important determinant of X-ray quality, the HVL (Half Value Layer), has been evaluated. Materials and Methods: The HVLs of a orthovoltage X-ray machine in 120 and 180 kVp are measured, using an empirical method, in which the HVLs are ...

PURPOSE To analyze the outcomes of patients from a single institution treated with surgery and orthovoltage intraoperative radiotherapy (IORT) for pancreatic adenocarcinoma. METHODS We retrospectively reviewed 23 consecutive patients from 1990-2001 treated with IORT to 23 discrete sites with median and mean follow up of 6.5 and 21 months, respectively. Most tumors were located in the head of ...

This is a word of caution to anyone using ionization chambers protected by thin rubber sheaths in water. Four Farmer-type ionization chambers contaminated with talcum powder were received for calibration by the Accredited Dosimetry Calibration Laboratory at the University of Texas M. D. Anderson Cancer Center. The chambers show a marked energy dependence (5% to 20%) to soft orthovoltage x rays....

Improvements have been made in the measurement of dose profiles in several types of X-ray beams. These include 120-kVp X-ray beams from an orthovoltage X-ray machine, 6-MV Bremsstrahlung from a medical LINAC in conformal mode and the 50–200 keV energy spectrum of microbeams produced at the medical beamline station of the European Synchrotron Radiation Facility. Using a quadruple metal–oxide–sem...

Background: Keloids are benign fibrous dermal tumors originating from skin injury after surgery, piercing or others wounds. Materials and Methods: Sixty-two patients with keloids were treated postoperatively using orthovoltage irradiation. The total dose delivered was 12 Gy in three consecutive days, 4Gy per fraction. Treatment started 24 h after surgery. The median follow-up was 44.5 months. R...

background: keloids are benign fibrous dermal tumors originating from skin injury after surgery, piercing or others wounds. materials and methods: sixty-two patients with keloids were treated postoperatively using orthovoltage irradiation. the total dose delivered was 12 gy in three consecutive days, 4gy per fraction. treatment started 24 h after surgery. the median follow-up was 44.5 months. r...