-
1 mSv is equal to ______ rem.
C. 0.1
1rem = 10mSv
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Regarding linear accelerators, maximum photon energy is equal to the energy of the ____________ striking the target.
maximum photon energy is equal to the energy of the ELECTRON striking the target
-
If the total body is exposed to a dose of 4500 cGy in a single exposure, the most likely cause of death would be:
C. cerebral edema
(CNS syndrome occurs with doses of ≃ 5,000cGy and up)
-
What is the allowable cumulative exposure for a radiation worker?
1 rem times the worker's age in years
(10 mSv X age in years)
-
Which of the following interactions are between an incident photon & an atomic nucleus?
B. pair production
-
A "star" shot on a linac is performed to test the rotational axis of the:
1. collimator 2. couch 3. gantry
C. 1, 2 & 3
-
The average photon beam energy produced by a 6 mV linac is approx ____ mV:
C. 2
-
Linear accelerators have which of the following type of target?
B. transmission
-
According to the NRC, what is the MPD for those who are NOT trained radiation workers?
C. 0.1 rem/yr
(1 mSv/yr)
-
The stomach is located in the ______ upper quadrant.
a. right
b. left
b. Left upper quadrant
-
In the normal adult male, the prostate is located ________ to the bladder.
C. inferior
-
Breast cancer metastasizes to:
1. bone 2. lung 3. brain
A. 1, 2 & 3
breast ca mets to bone, lung & brain
-
Nasopharyngeal tumors drain through what lymph nodes first?
B. posterior cervical
-
Which portion of the spine is the most common site for a spinal compression?
B. thoracic
-
The pituitary is located:
A. 2 cm anterior & 2 cm superior to the EAM
-
When treating tongue cancer, the purpose of the bite block is to:
A. flatten the tongue
-
The vallecula is locate at the levl of wich anatomical structure?
D. hyoid bone
-
The inferior border of a larynx port for a vocal cord tumor should correspond to:
C. cricoid cartilage
-
The false vocal cords are located ________ to the glottis.
a. superior
b. inferior
a. superior
-
Backscatter factors are independent of:
B. SSD
-
When manipulating a CT image, increasing the width of the window:
1. decreases contrast 2. increases latitude
3. increases speed
C. decreases contrast & increases latitude
(window = contrast)
-
RBE is dependent upon:
1. radiation quality 2. dose per fraction
3. tissue irradiated
C. Radiation quality & Dose per fraction
-
When dealing with OER and anoxic tissue, which would be the most effective?
D. protons
-
Which of the following is required for the fabrication of custom blocks?
1. SAD 2. Source to Image Distance
3. Source to block tray distance
C. Source to image distance (SID) & Source to block tray distance
-
When treating a lesion on the outside of the nose with electrons, what is the major reason to place a wax-coated shield in the nose?
C. to decrease the dose to the inside of the nose
-
If the HVL of lead is 3 mm, it would require _______mm of lead to reduce exposure of 100 mR at 4 meters to 100 mR at one meter.
12 mm
-
Two wedges are used to treat a maxillary antrum tumor through an anterior and a lateral port. What part of the wedges should be adjacent?
- C. thick side anterior to thick side laterally
- (heel to heel)
-
If 1.5 cm is added to the inferior border of a treatment port, what happens to the original isocenter if you are not using independent jaws>
A. shifts 0.75 inferiorly
-
How long after completion of treatment is fibrosis generally seen?
D. 1 year
-
When treating the parotid gland with standard fractionation, xerostomia will occur at what dose:
D. 2500-3500 cGy
(permanent after 4000 cGy)
-
Written defamation of character is best known as:
a libel
b. slander
a. Libel
-
Which is more radioresistant:
D. Mature cartilage
-
Mayneord's F factor is a correction for which of the following:
D. distance
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