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5.0
PH3402025- 2026 QUESTIONS WITH DETAILED
VERIFIED ANSWERS (100% CORRECT ANSWERS)
/ALREADY GRADED A+
Quiz: Name 4 strategies of external beam radiotherapy to improve
Therapeutic ratio?
Ans: BBPM
Beam Collimation
Beam Angles
Proton Energy
Motion Management
Quiz: Patients can receive a substantial radiation dose during
fluoroscopic procedures-What are three skin dose indicators?
Ans: 1) Air Kerma - measured using ionization chambers; DNC radiation
scatter and patients body composition
2) Entrance Surface Dose - direct measure of skin dose; doesnt take into
account the effect of scatter radiation or body composition
3) Peak Skin Dose - provides an accurate estimate or skin dose, Does
consider the above
Quiz: Typically for X-ray film material the maximum optical density is
Dmax ≈ 3 for a typical diameter of 6 µm for the developed grain. What
is the approximate number of grains per unit area?
Ans: G = (Dmax)/(0.434*@) = 3/(0.434*(3E-6)^2)=2.44E11
,**idk if that math is right
Quiz: Describe two types of Ultrasound images that can be generated
from sonographic instruments and provide details of what creates
contrast in the images?
Ans: 1. B Mode - produces 2d grayscale image of body's internal structures
with different shades of gray depending on density. Used to identify the
presence of abnormalities such as tumours, cysts, fluid collection
2. Doppler Imaging - change in frequency of the sound due to relative
motion of source and receiver. Diagnostic ultrasound uses the change
in frequency of US signal backscattered from red blood cells.
Frequency increases or decreases based on direction of blood flow in
relation to transducer
3. M Mode - 1 D image to evaluate motion such as the heart - Reflects a
motion of the heart structures over time. Accurate evaluation of rapid
movements.
Quiz: Describe in detail why is it vital to know an accurate patient
weight prior to MRI imaging
Ans: 1) weight limit on table
2)size entrance, may need to open
3)more movement = worse image quality, accurate weight makes sure
patient position is correct
4) contrast dosing (if used)
Examstudy - Stuvia US
, Quiz: What is the goal radiation therapy?
Ans: To deliver the maximum amount of radiation needed to kill the
cancer, while sparing normal surrounding tissue
Quiz: What are the advantages and disadvantages of Brachytherapy?
Ans: Advantages: localized dose delivery to the target, sharp dose fall off
outside the target volume, better conformal therapy.
Disadvantages: only good for localized tumors, only good for small lesions,
very labor intensive
Quiz: Describe two ultrasound artifacts?
Ans: 1) Refraction - The change of sound direction on passing from one
medium to another; when US waves pass at oblique angles, the waves
propogate at different velocities causing bending of waves beams -
causes spatial disortion and loss of resolution of image
2)Mirror Image - caused by reflection of the the beam at a large smooth
interface - causes image to be reflected twice - common when there
is a large acoustic mismatch sich as fluid air interface
Quiz: What is the mechanistic interpretation of the linear quadratic
model?
Ans: The linear component is a result from single particle interaction with
the probability of the interaction proportional to the dose - This implied
that the higher the dose, the greater the damage caused to the cell -
lethal damage
Examstudy - Stuvia US
In today's fast-paced educational landscape, students need reliable resources to excel in their studies.
5.0
PH3402025- 2026 QUESTIONS WITH DETAILED
VERIFIED ANSWERS (100% CORRECT ANSWERS)
/ALREADY GRADED A+
Quiz: Name 4 strategies of external beam radiotherapy to improve
Therapeutic ratio?
Ans: BBPM
Beam Collimation
Beam Angles
Proton Energy
Motion Management
Quiz: Patients can receive a substantial radiation dose during
fluoroscopic procedures-What are three skin dose indicators?
Ans: 1) Air Kerma - measured using ionization chambers; DNC radiation
scatter and patients body composition
2) Entrance Surface Dose - direct measure of skin dose; doesnt take into
account the effect of scatter radiation or body composition
3) Peak Skin Dose - provides an accurate estimate or skin dose, Does
consider the above
Quiz: Typically for X-ray film material the maximum optical density is
Dmax ≈ 3 for a typical diameter of 6 µm for the developed grain. What
is the approximate number of grains per unit area?
Ans: G = (Dmax)/(0.434*@) = 3/(0.434*(3E-6)^2)=2.44E11
,**idk if that math is right
Quiz: Describe two types of Ultrasound images that can be generated
from sonographic instruments and provide details of what creates
contrast in the images?
Ans: 1. B Mode - produces 2d grayscale image of body's internal structures
with different shades of gray depending on density. Used to identify the
presence of abnormalities such as tumours, cysts, fluid collection
2. Doppler Imaging - change in frequency of the sound due to relative
motion of source and receiver. Diagnostic ultrasound uses the change
in frequency of US signal backscattered from red blood cells.
Frequency increases or decreases based on direction of blood flow in
relation to transducer
3. M Mode - 1 D image to evaluate motion such as the heart - Reflects a
motion of the heart structures over time. Accurate evaluation of rapid
movements.
Quiz: Describe in detail why is it vital to know an accurate patient
weight prior to MRI imaging
Ans: 1) weight limit on table
2)size entrance, may need to open
3)more movement = worse image quality, accurate weight makes sure
patient position is correct
4) contrast dosing (if used)
Examstudy - Stuvia US
, Quiz: What is the goal radiation therapy?
Ans: To deliver the maximum amount of radiation needed to kill the
cancer, while sparing normal surrounding tissue
Quiz: What are the advantages and disadvantages of Brachytherapy?
Ans: Advantages: localized dose delivery to the target, sharp dose fall off
outside the target volume, better conformal therapy.
Disadvantages: only good for localized tumors, only good for small lesions,
very labor intensive
Quiz: Describe two ultrasound artifacts?
Ans: 1) Refraction - The change of sound direction on passing from one
medium to another; when US waves pass at oblique angles, the waves
propogate at different velocities causing bending of waves beams -
causes spatial disortion and loss of resolution of image
2)Mirror Image - caused by reflection of the the beam at a large smooth
interface - causes image to be reflected twice - common when there
is a large acoustic mismatch sich as fluid air interface
Quiz: What is the mechanistic interpretation of the linear quadratic
model?
Ans: The linear component is a result from single particle interaction with
the probability of the interaction proportional to the dose - This implied
that the higher the dose, the greater the damage caused to the cell -
lethal damage
Examstudy - Stuvia US
