Wk 5 Flashcards
The process of identifying structures, target volumes or normal tissue, by outlining contours around them
structure (organ) segmentation
Basic level – physician and or dosimetrist designs fields based on radiographic anatomy (i.e. whole brain fields)
Conformal 3 D planning (CRT - Conformal Radiation Therapy)
IMRT
Intensity Modulated Radiation Therapy
VMAT
Volumetric Arc Therapy
The machine continuously reshapes and changes the intensity of the radiation beam as it moves around the body.
VMAT is a type of IMRT technique
In the fusion process, common anatomic features are identified in each data set and are used to link the data sets to form a ______?
composite set
uniformity in structure, composition, or nature.
Homogeneity
IGRT
Image-Guided Radiotherapy
EPI or EPID
MV Electronic Portal Imaging Device
-Uses therapy x-ray beams to verify patient setup positions
-Verify shape of treatment portals
Image quality and contrast is not as good as kV imaging due to Compton scattering on the film.
Disadvantage: higher imaging dose (1-5cGy) and poor image quality
MV Imaging (IGRT-2D)
MV energy produces photons in the ________ range
Compton
OBI
On-Board Imaging
kV X-ray tube with flat panel image detector mounted orthogonal to therapy x-ray beam on Linear Accelerator
Low imaging dose (.01-.1 cGy)
On-Board Imaging (OBI)
(IGRT-2D)
3D information acquired with CT scanner in the same room just before treatment
CT images provide volumetric and anatomic information in treatment room coordinates
CT image can be aligned with reference CT image from planning before treatment starts by use of soft tissue and bony contrast alignment
3D Volumetric Imaging
(IGRT)
Consists of a standard treatment unit with an amorphous silicon flat panel adapted for MV photons
Detector mounted on a retractable support
Image acquisition starts by rotating the gantry for a continuous 200° arc, acquiring 1 portal image per degree of rotation
Imaging dose range 2-8cGy
MV Cone-beam CT (MVCBCT)
Conventional kV x-ray tube mounted on a retractable arm at 90° to the treatment beam line
Involves acquiring multiple kV radiographs as the gantry rotates through at least 180° of rotation
Use of low energy, images demonstrate acceptable soft tissue contrast best used for target delineation
kV Cone-beam CT
CT scans used to reconstruct a set of 3DCT scans representing 3D anatomy at different times (or respiratory phases)
4D CT Imaging
__ imaging has better soft tissue contrast than __ imagers
kV, MV
__ doesn’t create the streaking from metallic objects that __ imaging does
MV, kV
_______ from imaging can be significant. Risks versus benefits must be evaluated
Total dose
An electronic record of health-related information on an individual that can be created, gathered, managed, and consulted by authorized clinicians and staff within one health care organization.
Electronic Medical Record (EMR)
An electronic record of health-related information on an individual that conforms to nationally recognized interoperability standards and that can be created, managed, and consulted by authorized clinicians and staff across more than one health care organization.
Electronic Health Record (EHR)
An electronic record of health-related information on an individual that conforms to nationally recognized interoperability standards and that can be drawn from multiple sources while being managed, shared, and controlled by the individual.
Personal Health Record (PHR)
