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Treatment Planning Test

Enter the letter for the matching Answer
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1.
The anatomical point A used when calculating dose for cervical and uterine treatments is located:
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2.
Radiation Therapy prescription
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3.
ISCF (for SAD Set-ups)
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4.
For non-isocentric treatments, _______ is the factor of choice to demonstrate central axis dose at a given depth.
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5.
Practical Range (Er) in cm Electron Beam in Tissue
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6.
The most widely used radium substitutes is:
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7.
Components of RT prescription
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8.
What is the half-life of radium-226?
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9.
What is the Dmax for a 24 MV beam?
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10.
Patient is to be treated with AP/PA fields (2:1). Total dose is 200 cGy. What is the dose to each field?
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11.
Contains a margin for subclinical extensions of the disease.
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12.
What is the half-life of cobolt-60?
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13.
What is the half-life of iridium-192?
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14.
What is the half-life of radon-222?
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15.
Given Dose
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16.
What is the half-life of iodine-125?
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17.
Treatment volume which allows for patient motion and set up uncertainties.
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18.
What is the Dmax for a 18 MV beam?
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19.
Hinge Angle
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20.
Treatment planning systems often combine CT images with images from other modalities. What is this called?
A.
Communication tool between the radiation oncologist and the treatment planning and delivery team (medical dosimetrist and radiation therapist) and provides the information required to administer the appropriate radiation treatment (W/L, pg. 493).
B.
3.82 days (W/L, pg. 303
C.
4.0 cm (RT Essentials, pg. 140).
D.
Er = MeV/2 (W/L, pg. 554).
E.
Given Dose= (TD/PDD) × 100 (W/L, pg. 509).
F.
Image fusion or image registration (W/L, pg. 542).
G.
PTV.
H.
200 cGy/3 = 66.7 cGy AP = 66.7 x 2 = 133.4 cGy. PA = 66.7 x 1 = 66.7 cGy.
I.
Defines the treatment volume, intended tumor dose, number of treatments, dose per treatment, and frequency of treatment. Also stated are the type and energy of radiation to be used, beam-shaping devices and any other appropriate factors (W/L, pg. 493).
J.
CTV.
K.
%DD or PDD (W/L, pg. 509).
L.
(Reference distance / Source Calculation Point Dose [SCPD])^2 *Reference distance = 100; SCPD = The set up SSD + Depth (W/L, pg. 508).
M.
59.4 days (W/L, pg. 303).
N.
HA = 180 - 2(wedge angle) (RT Essentials, pg. 135)
O.
Cesium-137 (W/L, pg. 303).
P.
1,622 years (W/L, pg. 303).
Q.
5.27 years (W/L, pg. 303).
R.
73.83 days (W/L, pg. 303).
S.
3.5 cm (RT Essentials, pg. 140).
T.
2 cm superior and 2 cm lateral to the center of the cervical os.
Type the Answer that corresponds to the displayed Question.
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21.
A 45 degree wedge is inserted into a field to modify the isodose curve. The toe section will allow (greater or lesser) intensity in part of the beam.
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22.
If setting a 10 x 10 field size using an isocentric technique, the field size on the patient’s skin would be?
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23.
What is the angle between the central rays of the two beams when using a wedged pair?
Type the Question that corresponds to the displayed Answer.
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24.
WA = 90 – (Hinge angle/2) (RT Essentials, pg. 135)
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25.
The intersection of the axis of rotation of the gantry and the axis of rotation of the collimator for the treatment unit (W/L, pg. 494).
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26.
The measurement of the patient’s thickness from the point of beam entry to the point of beam exit (W/L, pg. 494).
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27.
Equivalent Square= (4(L ×W)) / (2(L +W)) (W/L, pg. 498).
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28.
The distance beneath the skin surface where the prescribed dose is to be delivered (W/L, pg. 494)
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29.
Ratio of the dose rate of a given field size to the dose rate of the reference field size (W/L, pg. 496).
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30.
Physical dimensions set on the collimators of the therapy unit that determine the size of the treatment field at a reference distance (W/L, pg. 494).

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