Diagnostic Imaging
This imaging modality uses strong magnetic fields and radio waves to create detailed cross-sectional images of the body's internal structures.
mri
In an X-ray tube, this component is responsible for emitting electrons, while the other, often made of tungsten, serves as the target for high-speed electrons to produce X-rays.
Cathode and Anode
Before acquiring a full CT scan, a ____, is obtained to ensure patient alignment and scan range.
Scout image
The ODI should be accurate at all distances to at least:
2 mm
the lens of the eye should not receive more then ___ for occupational exposure?
150 msv
This imaging modality is particularly useful for detecting cancer, as it measures metabolic activity within the body by tracking the distribution of radioactive tracers.
PET
Occurs at low energy levels (less than KeV)
Coherent Scatter
In the context of CT simulation for radiation therapy, the_________ is a specialized view that provides a perspective of how a radiation treatment beam intersects a patient's anatomy. It is a two-dimensional projection or image that is generated based on the patient's CT scan data and the planned treatment beams.
Beams Eye View
The ____ is a device that measures the amount of ionizing radiation produced by a linear accelerator during radiation therapy. It uses ionization to detect and quantify the radiation dose delivered to a specific location, ensuring accurate and safe treatment for patients.
Ion chamber
occupational exposure for a pregnant worker is?
5msv
In this imaging technique, sound waves are used to create real-time images.
ultrasound
Produced when an xray photon interacts with an outer shell orbital electron with sufficient energy to eject it from orbit and alter its own path.
Predominant interaction in the diagnostic energy range.
Compton Scattering
During simulation, the patient needs to be in the center of the _____ so that the patients contour is not cut off. This ensures a good quality image.
A. Beams eye view
B. Field of View FOV
C. Isocenter View
FOV
This is a component in the linear accelerator that helps to create a more uniform and evenly distributed X-ray beam. It achieves this by reducing the intensity of the X-rays in the center of the beam, thereby flattening the dose profile to ensure that the radiation dose is delivered more uniformly across the treatment field.
Flattening Filter
When calibrations are attempted for electron beams, the preferred phantom material is:
distilled water
As an xray passes through matter, the xray beam undergoes a gradual reduction in the number of photons or exposure rate. This is known as
attenuation
Machines and treatment rooms are shielded to capture this type of interaction
Photodisintegration
Black areas on the CT scan represent ________________ objects such as gas in the stomach or air in the lungs.
-Low Density
-High Density
-Medium Density
Low density
The initial X-ray beam produced by the linear accelerator is often very narrow and focused. To achieve more uniform dose distribution and coverage of the treatment area, the _____is placed in the path of the beam.
Scattering Foil
Defined as the measurement tool used to evaluate an organization’s performance
quality indicator
The beam intensity will decrease with increasing distance. This is known as
The Inverse Square Law
An incoming photon is absorbed and instantly the energy is re-emitted as an electron, positron pair and ejected from the atom
Pair Production
The CT number accuracy for water must be checked daily. This tolerance must be within ______HU's
_____is a process in which electrons are emitted from the surface of a heated material, typically a metal, when it is heated to a sufficiently high temperature. This emission of electrons occurs due to the thermal energy absorbed by the material
Thermionic Emission
effective dose annually for occupational exposure is ?
50 msv