Radiation Therapy Treatment Planning
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show | 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).
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show | 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).
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show | Refers to the energy deposited at a specific point in a medium. The dose is measured at a specific point (in a patient or phantom) and is commonly measured in Gray (Gy). (W/L, pg. 493).
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Depth | show ๐
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Separation | show ๐
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SSD | show ๐
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show | The distance from the source of photons to the machines isocenter (W/L, pg. 494).
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show | 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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Field Size | show ๐
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show | The depth at which electronic equilibrium occurs for photon beams. Dmax is the point where the maximum absorbed dose occurs for single field photon beams and depends mainly on the energy of the beam (W/L, pg. 496).
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Output | show ๐
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show | 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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Gap Formula | show ๐
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show | Given Dose= (TD/PDD) ร 100 (W/L, pg. 509).
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show | TD= (Given dose x PDD at depth of calculation)/100 (W/L, pg. 509).
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show | (SSD1+ d)^2 / (SSD1+ Dmax )^2 ร(SSD2 )+ Dmax )^2/(SSD2+ d)^2
*New PDD = Old PDD x Mayneord F-factor (W/L, pg. 508).
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Inverse Square Law | show ๐
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show | Equivalent Square= (4(L รW)) / (2(L +W)) (W/L, pg. 498).
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Inverse Square Correction Factor (ISCF) [for SSD Set-ups] | show ๐
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show | ISCF = (Reference source calibration distance)^2 / (Treatment SSD +Dmax)^2
*(Reference source calibration distance = Reference distance + Dmax for the energy) (W/L, pg. 508).
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show | (Reference distance / Source Calculation Point Dose [SCPD])^2
*Reference distance = 100; SCPD = The set up SSD + Depth (W/L, pg. 508).
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show | MU/Time=(Prescribed Dose)/
(RDR*ISCF*Sc*Sp*PDD/100*Other)
(W/L, pg. 504)
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show | MU= (Prescribed Dose) / (RDRรISCFรScรTARรOther factors) (W/L, pg. 511).
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Monitor Unit Calculations for SAD (Isocentric) Set-ups (TMR) | show ๐
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Monitor Unit Calculations for SAD (Isocentric) Set-ups (TPR) | show ๐
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show | HA = 180 - 2(wedge angle) (RT Essentials, pg. 135)
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show | WA = 90 โ (Hinge angle/2) (RT Essentials, pg. 135)
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Electron Beam Mean Energy | show ๐
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Practical Range (Er) in cm Electron Beam in Tissue | show ๐
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show | MeV/3 (W/L, pg. 555).
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show | MeV/4 (W/L, pg. 555).
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show | A = (0.66mg/cm) x (active length of source in cm)
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Activity Half Strength Source | show ๐
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show | 200 cGy/3 = 66.7 cGy
AP = 66.7 x 2 = 133.4 cGy.
PA = 66.7 x 1 = 66.7 cGy.
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Patient is to be treated with total dose of 180 cGy in a four field arrangement AP, PA, RL and LL (2:1:1.5:1.5). What is the dose to each field? | show ๐
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Calculate the Gap: Field 1- Length = 17 cm, Width = 6 cm, Depth = 3 cm, SSD = 92 cm; Field 2- Length = 15 cm, Width = 12.5 cm, Depth = 3 cm, SSD = 91 cm. | show ๐
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What is the field size on a film if the collimator setting is 7 cm X 19 cm and the magnification factor is 1.33x? | show ๐
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show | (5.5/100) = (x/96); 100x = 528; x = 5.28.
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show | (102.4/x) = (85.5/100)^2; x = 140 cGy/Min.
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The optimum hinge angle for a 60 degree wedge would be: | show ๐
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Calculate the Gap: Field 1- Length = 10 cm, Width = 10 cm, Depth = 5 cm, SSD = 100 cm; Field 2- Length = 15 cm, Width = 10 cm, Depth = 4 cm, SSD = 100 cm. | show ๐
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Calculate the equivalent square for a field size of 10 cm X 15 cm. | show ๐
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What are the 80% and 90% isodose lines for a patient treated with a 16 MeV electron beam? | show ๐
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A patient is treated at 100 cm SSD with 6 MV photons. Collimator setting is 15 cm x 15 cm. There is no blocking. 300 cGy per fraction is to be delivered at Dmax. What is the dose delivered at a depth of 5 cm? | show ๐
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A patient is prescribed a dose of 180 cGy at a depth of 10 cm with 10 MV photons at 100 cm SSD. The PDD is 60%. Calculate the dose to the depth of maximum dose. | show ๐
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What is the angle between the central rays of the two beams when using a wedged pair? | show ๐
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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. | show ๐
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show | Heterogeneity Corrections.
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show | GTV.
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show | PTV.
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The area enclosed by the isodose surface selected. | show ๐
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Contains a margin for subclinical extensions of the disease. | show ๐
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The anatomical point A used when calculating dose for cervical and uterine treatments is located: | show ๐
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If setting a 10 x 10 field size using an isocentric technique, the field size on the patientโs skin would be? | show ๐
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show | Cesium-137 (W/L, pg. 303).
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Which radium substitute would be best suited to temporary implants of the breast and tongue? | show ๐
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What is the half-life of radium-226? | show ๐
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What is the half-life of cobolt-60? | show ๐
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What is the half-life of cesium-137? | show ๐
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What is the half-life of iridium-192? | show ๐
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show | 59.4 days (W/L, pg. 303).
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What is the half-life of palladium-103? | show ๐
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show | 2.7 days (W/L, pg. 303).
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show | 3.82 days (W/L, pg. 303
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show | 35/100 = x/115; 40/100 = y/115;
100x = 4025; 100y = 4600;
x = 40.25 y = 46
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show | Fills in deficits to have a more homogenous dose distribution. Shifts dose lines and brings Dmax closer to the skin surface when skin sparing is not desirable (Mosbyโs RT Study Guide, pg. 102).
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For non-isocentric treatments, _______ is the factor of choice to demonstrate central axis dose at a given depth. | show ๐
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When looking up the PDD or TMR for a given depth and field size, _______ should be used when there are blocks or MLC. | show ๐
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show | 20 cGy/min. (Mosbyรขยยs RT Study Guide, pg. 108).
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LDR isotopes deliver at a dose rate =_______cGy/min | show ๐
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show | The 50% isodose line in low energy beams like Cobalt 60 or the isodose line at a depth of 10 cm for higher energy beams used in modern linear accelerators (Mosbyโs RT Study Guide, pg. 101).
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What is the Dmax for a 1.25 MV beam? | show ๐
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show | 1.0 cm (RT Essentials, pg. 140).
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show | 1.5 cm (RT Essentials, pg. 140).
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show | 2.5 cm (RT Essentials, pg. 140).
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What is the Dmax for a 18 MV beam? | show ๐
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show | 4.0 cm (RT Essentials, pg. 140).
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show | Image fusion or image registration (W/L, pg. 542).
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What is the practical range in tissue for a 10 MeV electron beam? | show ๐
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show | 200 cGy/5 = 40 cGy; AP field = 40 x 3 = 120 cGy; PA field = 40 x 2 = 80 cGy.
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