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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Components of RT prescription | show 🗑
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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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show | The distance beneath the skin surface where the prescribed dose is to be delivered (W/L, pg. 494)
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show | 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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SSD | show 🗑
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SAD | show 🗑
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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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show | 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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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 🗑
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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 🗑
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show | Given Dose= (TD/PDD) × 100 (W/L, pg. 509).
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Tumor Dose (Dmax Dose) | show 🗑
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show | (SSD1+ d)^2 / (SSD1+ Dmax )^2 ×(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 🗑
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show | Equivalent Square= (4(L ×W)) / (2(L +W)) (W/L, pg. 498).
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Inverse Square Correction Factor (ISCF) [for SSD Set-ups] | show 🗑
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ISCF (for Extended Distance Set-ups) | show 🗑
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ISCF (for SAD Set-ups) | show 🗑
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Time/MU Calculations for SSD Set-ups | show 🗑
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Monitor Unit Calculations for SAD (Isocentric) Set-ups (TAR) | show 🗑
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show | MU= (Prescribed Dose) / (RDR×ISCF×Sc×Sp×TMR×Other factors) (W/L, pg. 511).
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Monitor Unit Calculations for SAD (Isocentric) Set-ups (TPR) | show 🗑
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Hinge Angle | show 🗑
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Wedge Angle | show 🗑
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Electron Beam Mean Energy | show 🗑
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show | Er = MeV/2 (W/L, pg. 554).
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show | MeV/3 (W/L, pg. 555).
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Electron 90% Isodose line | show 🗑
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Activity Full Strength Source | show 🗑
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Activity Half Strength Source | show 🗑
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Patient is to be treated with AP/PA fields (2:1). Total dose is 200 cGy. What is the dose to each field? | show 🗑
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show | AP field: 30 x 2 = 60 cGy
PA field: 30 x 1 = 30 cGy
RT Lat field: 30 x 1.5 = 45 cGy
LT Lat field: 30 x 1.5 = 45 cGy
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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 🗑
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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 🗑
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show | (5.5/100) = (x/96); 100x = 528; x = 5.28.
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The dose rate on a linear accelerator is 102.4 cGy/Min at 100 cm. What is the dose rate at 85.5 cm? | show 🗑
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show | 180 - 2(60) = 60 degrees.
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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 🗑
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show | (4(10x15) / (2(10+15) = 12.
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What are the 80% and 90% isodose lines for a patient treated with a 16 MeV electron beam? | show 🗑
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show | (300 x 87.9)/100 = 263.7 cGy. (See Table 24-6 W/L pg. 519)
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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 🗑
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show | Hinge Angle.
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show | Greater.
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show | Heterogeneity Corrections.
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show | GTV.
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Treatment volume which allows for patient motion and set up uncertainties. | show 🗑
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show | Treated volume.
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Contains a margin for subclinical extensions of the disease. | show 🗑
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The anatomical point A used when calculating dose for cervical and uterine treatments is located: | show 🗑
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If setting a 10 x 10 field size using an isocentric technique, the field size on the patient’s skin would be? | show 🗑
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show | Cesium-137 (W/L, pg. 303).
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show | Iridium-192 (W/L, pg. 305).
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What is the half-life of radium-226? | show 🗑
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show | 5.27 years (W/L, pg. 303).
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show | 30.0 years (W/L, pg. 303).
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What is the half-life of iridium-192? | show 🗑
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show | 59.4 days (W/L, pg. 303).
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show | 16.99 days (W/L, pg. 303).
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show | 2.7 days (W/L, pg. 303).
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What is the half-life of radon-222? | show 🗑
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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 (Mosby’s 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 🗑
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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 🗑
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show | 20 cGy/min. (Mosbyâs RT Study Guide, pg. 108).
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show | 0.5 to 2.0 cGy/min. (Mosbyâs RT Study Guide, pg. 108).
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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 (Mosby’s RT Study Guide, pg. 101).
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show | 0.5 cm (RT Essentials, pg. 140).
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What is the Dmax for a 4 MV beam? | show 🗑
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show | 1.5 cm (RT Essentials, pg. 140).
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What is the Dmax for a 10 MV beam? | show 🗑
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What is the Dmax for a 18 MV beam? | show 🗑
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What is the Dmax for a 24 MV beam? | show 🗑
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show | Image fusion or image registration (W/L, pg. 542).
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show | Er =MeV/2; Er = 10 MeV/2; Er = 5 cm
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A dose of 200 cGy/fraction is to be delivered to a depth of 10 cm using an AP:PA treatment arrangement. The fields are weighted 3:2 AP:PA. What is the dose per field? | show 🗑
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