Black & Yellow Exam Flashcards
1
Q
1 mSV = __ rem
A
0.1
2
Q
If the total body is exposed to a dose of 4500cGy in a single exposure, most liekly cause of death is __.
A
Cerebral edema
3
Q
Linac have what kind of target?
A
Transmission
4
Q
Which does not ionize directly? p+ neutron alpha electron
A
neutron
5
Q
Monitoring of dose rate and field symmetry is best accomplished by using: Pocket dosi Ion chamber TLD Geiger counter
A
Ion chamber
6
Q
In the pancreas, where do most tumors originate from?
A
Head
7
Q
Which of the following are used for area surveys? (select all that apply)
ion chamber
parallel plate chamber
GM counter
A
ion chamber
GM counter
8
Q
According to NRC, MPD for non-radiation workers is ___ rem/yr.
A
0.1
9
Q
Largest paranasal sinus cavity is ___.
A
Maxillary
10
Q
Photoelectric interactions of a 60 keV beam are greatest in __.
A
bone
11
Q
Which is the most radiosensitive? Sp cord heart lung liver
A
lung
12
Q
The stomach is in which quadrant?
A
LU quadrant
13
Q
Where is a sarcoma most likely to mtastasize?
A
Lung
14
Q
Most common primary brain tumor is __.
A
Glioma
15
Q
Most common site fro mets spread of carcinoma of the penis is __.
A
Inguinal nodes
16
Q
Hypofractionation is:
A
Tx given in fewer fractions than is standard
17
Q
The epiglottis covers the __.
A
Larynx
18
Q
In the normal adult male the prostate is located ___ to the bladder.
A
Inf
19
Q
The lower constricted portion of the uterus is called:
A
cervix
20
Q
The inguinal nodes are generally included in which of the following tx sites? cervix vulva prostate rectum
A
vulva
21
Q
The td 5/5 of the whole liver using standard fractionation (180-200cGy/day) is:
A
2500-3000 cGy
22
Q
When treating the entire CNS axis, the bottom of the spine port generally extends to the level of ___ when encompassing the cauda equina.
A
S2
23
Q
A multiple field technique (3 or more fields) is generally utilized when treating pituitary tumors, opposed 2 lateral fields, to avoid an excessive dose to what structure?
A
temporal lobes
24
Q
What quadrant is the spleen located in?
A
LUQ
25
What ext landmark can be used to localize the top of the larynx?
Thyroid prominence
26
Bifurcation of trachea is at __.
T4/T5
27
The vallecula is located at the level of which of the following anatomical structures?
Hyoid bone
28
The inf border of a larynx port for vocal cord carcinoma should anatomically correspond to:
Cricoid cartilage
29
What type of lung cancer has the highest instance od mets at diagnosis?
Small cell
30
Which of the followin are encompassed in a "German helmet" radiation port when treating ALL?
Cribiform plate
Meninges
Post retina
All of the above
31
A strontium-90 applicator may be useful in the tx of which of the following diseases of the eye?
Retinoblastoma
Malignant melanoma
Pterygium
Pterygium
32
The td 5/5 of the whole brain is __.
4500 cGy
33
```
Which is the most radiosensitive?
Liver
Spine
Brain stem
Optic chiasm
```
Liver
34
A non-osseous tumor of the bone marrow is __.
Multiple myeloma
35
The false vocal cords are located at __ to the glottis.
Sup
36
Why is a tumor of the parotid gland frequently treated with ispilateral beam arrangement?
to avoid the spine
to avoid the eyes
to avoid the contra parotid
to avoid the contra parotid
37
```
When treating with orthovoltage xrays, the PDD will increase with all of the following except:
increasing FS
increasing kV
increasing mA
increasing the distance
```
increasing mA
38
When manipulating a CT image, increasing hte width of the widow:
Decreases contrast
Increases latitude
Increases speed
Decreases contrast
| Increases latitude
39
TD 55/ both whole lungs:
1500-2500 cGy
40
RBE is dependent on which of the following? (Select all)
Radiation quality
Radiation dose per fraction
Tissue irradiated
All
41
```
When dealing with OER and anoxic tissue, which would be most effective?
6 MV photons
Protons
Neutrons
Electrons
```
Protons
42
Which is required for fabricating custom blocks? (select all that apply)
Source axis distance
Source image distance
Source to block tray distance
Source image distance
| Source to block tray distance
43
```
To verify that the radiation field and the light field are aligned on a 10 MV accelerator, you could use:
Tissue eq phantom and ion chamber
Mechanical distance indicator and paper
A shielding block and redi pack
Readi pak, pen and ruler
```
Readi pak, pen and ruler
44
When a FS is changed during the course of tx, which are true? (select all)
Tx depth must change
Physician must incl changes in rx
MUs or time must be recalced
Physician must incl changes in rx
| MUs or time must be recalced
45
2 major energies associated with Co-60 beta decay are gamma energies of
1.17 and 1.33 MeV
46
The wedge angle refers to "the angle through which an isodose curve is tilted at the central ray of a beam at a specified depth." The rec depth is:
10 cm
47
go over 209-211
48
The proximal and distal margin around a soft-tissue sarcoma should be at least __ cm.
5
49
```
In a 120 deg arc rotation technique, the center of the high dose zones would be:
Deeper than iso
Displaced toward surface
At iso
Same shape as 360 deg rotation
```
Displaced toward the surface
50
Which of the following is true regarding electron beams?
Directly ionizing due to negative charge
Less likely to interact with air than photons
Have a higher LET than photons
Directly ionizing due to negative charge
| Have a higher LET than photons
51
A pt is usually treated at 100 SSD. Pt must be treated on a stretcher at 135 SSD. For the tumor dose and size tx area to remain the same as originally planned, which of the following statements is true? (Select all that apply)
Col setting will inc
MU setting will inc
Exit dose will slightly inc
All
52
Backscatter factors are independent of:
SSD
53
If 1.5cm is added to the inf border of a tx port, what happens to the original iso if you are not using asym jaws?
Shifts 0.75 cm sup
Shifts 0.75 cm inf
Shifts 0.75 cm inf
54
Restraining a pt w/o consent can be considered:
battery
assault
both
55
Normal platelet count:
300,000
56
```
Bone marrow suppression occurs when treating:
Skull
Femur
Pelvic bones
Vertebrae
```
Pelvic bones
57
Does bleomycin or adriamycin sensitize the heart?
Adriamycin
58
Which route delivers hyperalimentation?
IM
Oral
IV
IV
59
When a pt is treated w/more than 1 beam, misalignment between POP beams can occur due to displacement of the:
taeget
col axis of rotation
gantry axis of rotation
All
60
```
Which of the following has the least radiosensitivity (most radioresistant)?
bone marrow
lymph tissue
muscle
mature cartilage
```
mature cartilage
61
```
Angle of mandible is located at:
C1
C3
C5
C7
```
C3
62
Vocal cords are within:
Larynx
Trachea
Larynx
63
Ext landmark for carina:
Angle of Louis
64
What is the primary reason to angle the gantry posteriorly when treating Grave's disease?
To avoid divergence into the lens
To assure coverage of the posterior orbit
To increase dose to orbital tissue
To assure coverage of protruding eye
To avoid divergence into the lens
65
For pts w/bladder cancer, the bladder should be full or empty during tx?
Empty
66
```
What is the most potent chemical modifier of radiosensitivity to X and Gamma Rays?
5FU
Oxygen
Misonidazole
Adriamycin
```
Oxygen
67
Regarding "flatness" of an MV beam, which of the following is true?
Beam flatness changes w/depth due to scatter and decreased intensity at the field edge
Adequate flatness is defined as +/- 3% over 80% of the field at the measured depth
Flatness profiles may be used to determine symmetry
All
68
```
The most common presenting symptom of Wilm's tumor is:
Fever
non-tender mass
bone pain
nausea
```
non-tender mass
