The dose distributions for a patient with cancer involving the sternum were calculated for both a kilovoltage x-ray beam and a megavoltage electron beam. The minimum target dose and dose uniformity over the target volume were significantly better using electrons (90%-101%) than kilovoltage x-rays (68%-119%). The calculated lung dose and integral patient dose were also less for electrons than ki...

This topical review provides an up-to-date overview of the theoretical and practical aspects of therapeutic kilovoltage x-ray beam dosimetry. Kilovoltage x-ray beams have the property that the maximum dose occurs very close to the surface and thus, they are predominantly used in the treatment of skin cancers but also have applications for the treatment of other cancers. In addition, kilovoltage...

Kilovoltage (kV) radiotherapy, also called superficial radiotherapy (SXT) or orthovoltage (DXT), is a well-known and effective treatment option for non-melanoma skin cancer some benign musculoskeletal conditions. Given its surface dose delivery, use in radiation oncology beyond cancers generally limited, but it has been shown to be extremely useful specific palliative applications. Here, we des...

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...

PURPOSE This study aimed to investigate the effect of changing the kilovoltage peak (kVp) on the radiographic assessment of dental caries. MATERIALS AND METHODS Seventy-five extracted posterior teeth with proximal caries or apparently sound proximal surfaces were radiographed with conventional E-speed films and a photostimulable phosphor system using 60 kVp and 70 kVp for the caries assessmen...

CT number is one of the indicators in determining diagnosis disease, so it necessary to ensure level accuracy. The aim determine parameters kilovoltage and tube current value. Descriptive quantitative analytic research method with previously tested linearity suitability number. Furthermore, variation kilovoltage: 80kVp, 100kVp, 140kVp value 192mAs. After that, was continued: 80mAs, 100mAs, 140m...

Computed tomography images have been acquired using an experimental (low atomic number (Z) insert) megavoltage cone-beam imaging system. These images have been compared with standard megavoltage and kilovoltage imaging systems. The experimental system requires a simple modification to the 4 MeV electron beam from an Elekta Precise linac. Low-energy photons are produced in the standard medium-Z ...

With implanted markers, daily prostate displacements can be automatically detected with six degrees of freedom. The reported magnitudes of the rotations, however, are often greater than the typical range of a six-degree treatment couch. The purpose of this study is to quantify geometric and dosimetric effects if the prostate rotations are not corrected (ROT_NC) and if they can be compensated wi...

BACKGROUND AND PURPOSE A comprehensive dosimetry intercomparison has been carried out involving all the radiotherapy centres, all external beam modalities and every radiotherapy treatment unit in the Republic of Ireland. MATERIALS AND METHODS Reference point measurements were made for all megavoltage photon beams. Doses were also investigated in planned three-field distributions. One of these...