Dosimetry: Study Guide Khan Chapters 9-14 questions
with verified answers
_______ depth is the ruler/ODI depth to iso Ans✓✓✓ Physical depth
_______ depth takes into account the electron density or density of a
material Ans✓✓✓ Effective depth
_______ is also known as the dose at dmax Ans✓✓✓ GD
_______ is heel towards the Y1 jaw Ans✓✓✓ Y1 IN
_______ is the OAR + margin Ans✓✓✓ PRV, planning organ at risk
volume
_______ primary purpose is to verify treatment volume under actual
conditions Ans✓✓✓ Port Films
_______ relaxation has H20 bright Ans✓✓✓ T2
_______ setup uses PDD Ans✓✓✓ SSD
_______ setup uses TAR, TMR, and TPR Ans✓✓✓ SAD
,________ CT scanners used rotate and stationary technology where the
detector is stationary Ans✓✓✓ 4th generation, not commonly used
due to cost of detectors
________ has delayed viewing due to processing and poor image dose
due to 6 MV imaging Ans✓✓✓ Port films
________ imaging uses FDG, has F18 as the positron emitting isotope,
and provides physiologic imaging Ans✓✓✓ Positron emission
tomography
________ is heel towards Y2 jaw Ans✓✓✓ Y2 OUT
________ is the conversion process from electrical to sound Ans✓✓✓
Piezoelectric effect
________ is the CTV + IM + SM Ans✓✓✓ PTV
________ is the dose at which optical density becomes so saturated it
won't change Ans✓✓✓ Saturation dose
________ is the dose in the middle of the maximum and minimum
target dose Ans✓✓✓ Median Target dose
,________ is the highest dose in an entire volume? Ans✓✓✓ Global
maximum
________ is used for the delineation of target volume and surrounding
structures in relation to the external contour. It provides quantitative
data for tissue heterogeneity corrections Ans✓✓✓ CT
________ relaxation is the time it takes to realign to the original
magnetic field. Ans✓✓✓ T1 relaxation
________ uses sound waves of 1-20 MHz Ans✓✓✓ Ultrasound
________ uses the hounsfield numbers and is the most commonly used
3D compensator Ans✓✓✓ CT
_________ are MV, have density adjustment, do not require therapist
to go into the room between fields, and have a flat panel arrays of solid
state detectors based on amorphous silicon technology Ans✓✓✓
EPIDS
_________ CT scanners have an arc array of detectors, use rotate and
rotate technology and are the most commonly used Ans✓✓✓ 3rd
generation
, _________ CT scanners use a focused electron beam Ans✓✓✓ 5th
generation
_________ has CT scans with detectors embedded in a flat panel
instead of a circular ring Ans✓✓✓ CBCT
_________ imaging uses a coil and proton density, and the protons
align to a magnetic field. It uses RF to knock the protons over 90
degrees and when the RF is turned off the protons are regrouped and
realigned. Ans✓✓✓ MRI
_________ is a device that converts electrical energy to ultrasound
energy and vice versa (piezoelectric crystal) Ans✓✓✓ Ultrasonic probe
or transducer
_________ is a magnetic field sensor that is scanned over the patient to
tell different densities, is a 3D compensator Ans✓✓✓ Magnetic
digitizer
_________ is an area outside the target that exceeds the target dose
and covers at least 2cm^2 Ans✓✓✓ Hot spot
_________ is CTV + IM Ans✓✓✓ ITV
with verified answers
_______ depth is the ruler/ODI depth to iso Ans✓✓✓ Physical depth
_______ depth takes into account the electron density or density of a
material Ans✓✓✓ Effective depth
_______ is also known as the dose at dmax Ans✓✓✓ GD
_______ is heel towards the Y1 jaw Ans✓✓✓ Y1 IN
_______ is the OAR + margin Ans✓✓✓ PRV, planning organ at risk
volume
_______ primary purpose is to verify treatment volume under actual
conditions Ans✓✓✓ Port Films
_______ relaxation has H20 bright Ans✓✓✓ T2
_______ setup uses PDD Ans✓✓✓ SSD
_______ setup uses TAR, TMR, and TPR Ans✓✓✓ SAD
,________ CT scanners used rotate and stationary technology where the
detector is stationary Ans✓✓✓ 4th generation, not commonly used
due to cost of detectors
________ has delayed viewing due to processing and poor image dose
due to 6 MV imaging Ans✓✓✓ Port films
________ imaging uses FDG, has F18 as the positron emitting isotope,
and provides physiologic imaging Ans✓✓✓ Positron emission
tomography
________ is heel towards Y2 jaw Ans✓✓✓ Y2 OUT
________ is the conversion process from electrical to sound Ans✓✓✓
Piezoelectric effect
________ is the CTV + IM + SM Ans✓✓✓ PTV
________ is the dose at which optical density becomes so saturated it
won't change Ans✓✓✓ Saturation dose
________ is the dose in the middle of the maximum and minimum
target dose Ans✓✓✓ Median Target dose
,________ is the highest dose in an entire volume? Ans✓✓✓ Global
maximum
________ is used for the delineation of target volume and surrounding
structures in relation to the external contour. It provides quantitative
data for tissue heterogeneity corrections Ans✓✓✓ CT
________ relaxation is the time it takes to realign to the original
magnetic field. Ans✓✓✓ T1 relaxation
________ uses sound waves of 1-20 MHz Ans✓✓✓ Ultrasound
________ uses the hounsfield numbers and is the most commonly used
3D compensator Ans✓✓✓ CT
_________ are MV, have density adjustment, do not require therapist
to go into the room between fields, and have a flat panel arrays of solid
state detectors based on amorphous silicon technology Ans✓✓✓
EPIDS
_________ CT scanners have an arc array of detectors, use rotate and
rotate technology and are the most commonly used Ans✓✓✓ 3rd
generation
, _________ CT scanners use a focused electron beam Ans✓✓✓ 5th
generation
_________ has CT scans with detectors embedded in a flat panel
instead of a circular ring Ans✓✓✓ CBCT
_________ imaging uses a coil and proton density, and the protons
align to a magnetic field. It uses RF to knock the protons over 90
degrees and when the RF is turned off the protons are regrouped and
realigned. Ans✓✓✓ MRI
_________ is a device that converts electrical energy to ultrasound
energy and vice versa (piezoelectric crystal) Ans✓✓✓ Ultrasonic probe
or transducer
_________ is a magnetic field sensor that is scanned over the patient to
tell different densities, is a 3D compensator Ans✓✓✓ Magnetic
digitizer
_________ is an area outside the target that exceeds the target dose
and covers at least 2cm^2 Ans✓✓✓ Hot spot
_________ is CTV + IM Ans✓✓✓ ITV
