What is Epid dosimetry?
The electronic portal imaging device (EPID) is used for patient setup during radiotherapy sessions. Dosimetric verification is done using ion chambers, diodes and thermoluminescence detectors. In intensity-modulated radiation therapy (IMRT) the dosimetry is a sophisticated and time-consuming task.
What is Portal dosimetry?
Portal Dosimetry is a system for the verification of IMRT plans. It has the following components: The portal dose image prediction (PDIP) software. The terms Portal Dose Prediction (PDP) and Portal Dose Image Calculation (PDIC) are also used. This module is part of the Eclipse treatment planning system.
What is Invivo dosimetry?
In vivo dosimetry (IVD) is in use in external beam radiotherapy (EBRT) to detect major errors, to assess clinically relevant differences between planned and delivered dose, to record dose received by individual patients, and to fulfill legal requirements.
What does Epid mean?
Definition. Electronic portal imaging devices (EPIDs) are used to measure the x-ray intensity transmitted through a patient from a radiation port during a treatment session.
How does an Epid work?
For electronic portal imaging, instead of a film, an electronic portal imaging device (EPID) is placed in the exit beam to produce the image. The images are captured and displayed on a video screen. Boyer et al.
Whats is Epid?
Electronic Portal Imaging Devices (EPIDs) are digital x-ray imaging systems that use the megavoltage treatment beam to acquire projection images of radiotherapy patients.
What is the meaning of Epid?
What is DRR in radiotherapy?
In radiotherapy, a digitally recon- structed radiograph (DRR), which is used for treatment verification in CT simulation (10, 11), is one of the impor- tant images which can be sent via telecomunication.
What is DMAX radiotherapy?
DMAX may refer to: Dmax, Maximum point dose to an organ or tumor target in radiotherapy cancer treatment. In densitometry of optics and imaging “D-max” refers to maximum optical density: The greatest achievable opaqueness or optical absorbency.
What is a DRR image?
DRRs are simulated radiographic images produced through perspective projection of a three-dimensional (3D) image (volume) onto a two-dimensional (2D) image plane. The typical example of a DRR would be to simulate an X-ray image from a computed tomography (CT) volume.
What are the 4 patterns of disease used in epidemiology?
Descriptive epidemiology searches for patterns by examining characteristics of person, place, & time . These characteristics are carefully considered when a disease outbreak occurs, because they provide important clues regarding the source of the outbreak.
How do you calculate the incidence rate?
How Do You Calculate Person-Time Incidence Rates? Person-time incidence rates, which are also known as incidence density rates, are determined by taking the total number of new cases of an event and dividing that by the sum of the person-time of the at-risk population.
What is SSD in radiation therapy?
Purpose: Source to surface distance (SSD) plays a very important role in external beam radiotherapy treatment verification. In this study, a simple technique has been developed to verify the SSD automatically with lasers. The study also suggests a methodology for determining the respiratory signal with lasers.
How is a DRR produced?
The generation of DRR images involves creating a digital reconstruction of an image created by a Three-Dimensional (3D) imaging system such as a Computed Tomography (CT) scan or Magnetic Resonance Imaging (MRI) to produce a new Two-Dimensional (2D) image that emulates a medical X-ray scan.
How do you calculate incidence rate?
Incidence = (New Cases) / (Population x Timeframe)
- (25 new cases diabetes mellitus)/(5,000 people x 5 years) =
- (25 new cases) / (25,000 people-year) =
- 0.001 cases/people-year =
- 1 case / 1000 people-year.
