Percent Depth Dose
The number 100 or 1 is for the PDD at what depth.
What is the depth of dmax
Wedge Factor is this?
The dose with a wedge/the dose without a wedge
1 cm is the dmax
What is 4MV?
This substance is used to describe the quality of the beam.
What is HVL/HVT?
A right triangle that is 3, 4, 5 cm
What is 6 cm2?
The number/percentage of PDD gets smaller.
What happens to PDD the deeper it is calculated in the patient?
This equation has two formulas that are.
What is magnification factor? What is image/Object size or the SID/SOD?
The factor of ___ is used when the SSD changed from 4cm to 8cm.
What is 1/4th? What is .25?
In a fixed SSD technique, the dose is routinely normalized:
What is dmax?
The box is 6 in long and 1 feet wide.
What is 12 in2 or .5 ft2?
Decreasing the energy, field size and distance does this to PDD.
What is decrease PDD?
The equation will always be greater than 1.
What is magnification factor?
The SSD read 98.5 cm.
What is the SSD of a SAD treatment at 6MV?
A patient's spine is being treated and the gantry angle is at 160 degrees. The SAD is
What is 100cm?
This pie 20 cm wide straight down the middle.
What is 314 cm2?
Higher energies has this effect on PDD
What is increases?
The Mayenord's factor formula is
What is (SSD2 +dmax)^2(SSD1 + d)^2/(SSD2 +d)^2(SSD1 + dmax)^2
Lower energies does this to BSF.
What is decreases?
The gantry is treating 180 degrees, rotating CCW. The starting angle is 90 and the final angle is
What is 270?
The adjusted dose has the .9 tray factor is applied to 80 cGy.
What is 72cGy?
The absorbed dose at a depth divided by the absorbed dose at dmax.
What is the definition of PPD?
The inverse factor is expressed as
What is (SSD1)^2/(SSD2)^2
3 cm
What is the dmax for a 12MV beam?
Keeping the same order, the Y, X and Z axis is also referenced by
What is long, lat and vert.
The dmax depth for a patient treated with parallel opposed fields weighted 3:1 for a brain with a 6MV linac. The right field size is 8 x 8 cm and the left side is 10 x 10 cm. The cGy/MU for a 10 x 10 cm field is 1 and the area correction factor for the 8 x 8 cm field is .95. The patient is recieving 10 treatments and the total dose is 18GY.
What is 1.5 cm?