What is the ratio of dose at depth in tissue to the dose at electronic equilibrium (Dmax) on the beam axis known as? - ️️PDD
What is the TD5/5 for the optic chiasm? - ️️60 Gy
What is the term for a representation of the dose in an irradiated volume as a function of spatial position along ...
Mosby 233 Mock Exam Questions
Perfectly Answered
What is the ratio of dose at depth in tissue to the dose at electronic equilibrium (Dmax) on the beam
axis known as? - ✔ ✔ PDD
What is the TD5/5 for the optic chiasm? - ✔ ✔ 60 Gy
What is the term for a representation of the dose in an irradiated volume as a function of spatial
position along a single line? - ✔ ✔ dose profile
What is the term for blue coloring of skin or nails, observed as a sign of low oxygen content? - ✔ ✔
cyanosis
What is the term for the procedure used in which an implant is made using a trocar, with radioactive
sources introduced into the trocar and then the trocar is removed? - ✔ ✔ interstitial afterloading
What is the threshold dose for radiation pneumonitis? - ✔ ✔ 20-25 Gy
What is the total dose administered to a prophylactic cranial irradiation for ALL? - ✔ ✔ 1800 cGy
What is the transient sensation of electrical shock traveling down the neck and extremities following
radiation to the spine referred to? - ✔ ✔ Lhermitte's sign
What is the tunica albuginea? - ✔ ✔ capsule of white collagenous connective tissue in the ovaries
What is the worst prognosis for a primary skin cancer? - ✔ ✔ melanoma
What is the x,y,z coordinate system used for? - ✔ ✔ describe the location of a point in space relative
to iso
What kind of shock is associated with bacterial infections and its toxic byproducts? - ✔ ✔ septic
shock
What percentage of adenomatous polyps of the colon contains invasive cancer cells? - ✔ ✔ 3-5%
What radiation interaction with matter occurs independently of atomic number? - ✔ ✔ Compton
effect
What relationship does mass attenuation coefficient (µ/p) have with density? - ✔ ✔ independent
What should a therapist do if a chest tube becomes dislodged while moving a patient? - ✔ ✔ apply
an airtight dressing over the opening
,What should the console and control panel for the linac have a visual display of? - ✔ ✔ beam energy,
treatment mode, monitor units, timer, and beam on/off status
What should the therapist do when an immobilization device is determined? - ✔ ✔ consider patient
position, beam orientation, and finally which device
What should the total dose be to a lumpectomy site after accelerated PBI utilizing HDR brachy? - ✔ ✔
40-50 Gy
What technique is used to treat early pre-cancers of the cervix? - ✔ ✔ loop electrosurgical excision
procedure (LEEP)
What thickness of cerrobend would be equivalent to 5cm of lead? - ✔ ✔ 6.0cm
An important risk factor for the development of cervical cancer is: - ✔ ✔ human papilloma virus
(HPV)
Arrange the following X-ray energies in order of increasing PDD penetration: 1) orthovoltage 2) 18 MV 3)
10 MV 4) superficial - ✔ ✔ superficial, orthovoltage, 10MV, 18MV
As overall time of treatment is altered, with fraction size and total dose remaining unchanged, the
biological effect does what? - ✔ ✔ increases as time is shortened
As you're escorting the patient into the room, she begins to collapse. You help her safely to the floor,
what do you do next? - ✔ ✔ responsiveness check (shake patient & shout name)
Before administering IV contrast, it's important to check BUN and Creatinine levels to assure proper
function of what? - ✔ ✔ kidneys
Beyond the point of beam intersection, what would be an advantage of using the wedged pair
technique? - ✔ ✔ rapid dose falloff
**highest dose concentration near hinge of wedge, then rapid falloff
Cells of malignant growth are commonly: 1) anaplastic, 2) well differentiated, 3) slow growing, 4) poorly
oxygenated - ✔ ✔ 1) anaplastic
**when cells lose all order and ability to function normally
Chondrosarcoma originates in what type of tissue? - ✔ ✔ osseous tissue
Clarkson's method is used to determine the scatter produced in what kind of fields? - ✔ ✔ irregular
fields
, Diastolic pressure is the pressure within the arteries that exists while the heart is what? - ✔ ✔
resting
Dose is normalized to what in an SAD technique? - ✔ ✔ treatment depth
Dose is normalized to what in an SSD treatment technique? - ✔ ✔ Dmax
Electron contamination of high energy photon beams may result from photon interactions with what? -
✔ ✔ collimators
Epistaxis is the medical term for what? - ✔ ✔ nosebleed
167 MU were calculated to deliver 100cGy to a tx field including a wedge. Wedge was accidentally
omitted but 167 MU were still used. If wedge factor was 0.752 and TMR was 0.796, what was the actual
dose delivered? - ✔ ✔ 133 cGy
**MU x TMR x WF (but wedge was omitted)
167 x 0.796 = 132.9
1kg is equal to how many pounds? - ✔ ✔ 2.2lbs
A 6MV photon beam on the linac has an output at iso of 1.2 cGy/MU. What would be the inverse square
factor used in the MU cal for an extended distance of 120cm SSD? - ✔ ✔ 0.677
inverse square
(SAD/SSD + Dmax)ˆ2
(100/121.5)ˆ2 = 0.677
A dose of 300 cGy is to be delivered at 95cm SSD, but was delivered at 92cm SSD. What was the actual
dose? - ✔ ✔ 320
I1/I2 = (D2/D1)^2
A high energy photon strikes an orbital electron and scatters exactly 180 degrees. What's the max
energy of the scattered photon? - ✔ ✔ 255 kV
A low residue diet is recommended for patients receiving radiation to what area? - ✔ ✔
abdominopelvic regions
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