Accurate alignment of linear accelerator table rotational axis with radiation isocenter is critical for noncoplanar radiotherapy applications. The purpose of the present study is to develop a method to align the table rotation axis and the MV isocenter to submillimeter accuracy. We developed a computerized method using electronic portal imaging device (EPID) and measured alignment stability ove...

In order to calibrate the Super-Kamiokande experiment for solar neutrino measurements, a linear accelerator (LINAC) for electrons was installed at the detector. LINAC data were taken at various positions in the detector volume, tracking the detector response in the variables relevant to solar neutrino analysis. In particular, the absolute energy scale is now known with less than 1% uncertainty.

Purpose Radiotherapy plays an important role for the treatment of tumor diseases in two-thirds all cases, but it is limited by side effects surrounding healthy tissue. Proton minibeam radiotherapy (pMBRT) a promising option to widen therapeutic window control at reduced effects. An accelerator concept based on existing tandem Van de Graaff and linac enables focusing 70 MeV protons form minibeam...

The study of the SPL (Superconducting Proton Linac), a 4 MW / 2.2 GeV H linac, began at CERN in 1999. Based on the large inventory of RF equipment decommissioned from the LEP (Large Electron Positron collider), it was originally proposed as an upgrade to the injector complex for the high energy accelerators. Since that time, the proposal has attracted the interest of an increasing number of phy...

Background and purposeVacuum cushion immobilization is commonly used during stereotactic body radiotherapy (SBRT) to reduce intrafraction motion. We investigated target bony anatomy motion (translations rotations) online adaptive SBRT on an MR-linac for pelvic/para-aortic lymph node metastases with without vacuum cushion.Materials methodsThirty-nine patients underwent 5x7 Gy a 1.5T MR-linac, 19...

In Korea, when replacing or discarding parts of a medical linear accelerator (linac), self-disposal is required in the consideration activity, but there no standard regulation to manage radioactive waste. The aim this study check activity each part determine disposal time according clearance level for self-disposal. results measuring components linac head disposed Varian, Elekta, and Siemens eq...

PURPOSE The magnetic fields of linac-MR systems modify the path of contaminant electrons in photon beams, which alters patient skin dose. To accurately quantify the magnitude of changes in skin dose, the authors use Monte Carlo calculations that incorporate realistic 3D magnetic field models of longitudinal and transverse linac-MR systems. METHODS Finite element method (FEM) is used to genera...

for superficial lesions, the electrons may be used for radiation therapy. the high energy photons and electrons are produced by a linear accelerator (linac).   many of electron fields need the shielding of normal or critical organs. the electron shields are usually lead slabs with few millimeter thickness which should be placed near the skin, less than 1 centimeter away from skin. in the inspec...

For the Linac Coherent Light Source II (LCLS-II) project at SLAC, a 1.3 GHz superconducting rf (SRF) linac is being constructed that will generate 4 GeV electron bunches high repetition rate to drive x-ray free lasers. The LCLS-II source, which comprises first three meters of injector, includes two normal-conducting, continuous-wave cavities: one-cell, 185.7 MHz gun and two-cell, buncher. It al...

A medical linear accelerator (LINAC) delivers high-energy X-rays or electrons to the patient’s tumor. In this study, we categorized failures and predicted downtime leading discontinuous radiation treatment using a descriptive time series analysis of 20-year maintenance dataset LINAC. LINAC failure records for 359 instances was collected from 2001 2021. Next, performed institution-specific seaso...