MDCB Calculations Practice Test Exam
Questions With 100% Verified Answers
The effective field size for a 10x10 field size, with 30% blocked is
approximately how many cm2? -
correct answer ✅8.5
A patient is treated with a 6 MV photon beam, 12.5 x 12.5 cm2 at
110 cm SAD to a 9.0 cm depth. The machine is calibrated to deliver
1.0 cGy per monitor unit at dmax for a 10 x 10 cm2 field at 100SSD.
The number of monitor units required to deliver 150 cGy at the
isocenter is:
TISSUE MAXIMUM RATIO (TMR) FOR 6 MV PHOTONS
Depth (cm) --- 10 x 10 cm2 --- 12 x 12 cm2 --- 14 x 14 cm2
1.5___________________1.0__________________1.0__________
_______1.0
9.0___________________0.810______________0.818__________
____0.824 -
correct answer ✅221
The dose rate at a patient's mid-plane is found to be 250 cGy/min
at 100 cm SAD. A protocol for hemi-body irradiation stipulates that
the dose rate must be no more than 100 cGy/min. At what
minimum SAD must the patient be treated? -
correct answer ✅158 cm
, MDCB Calculations Practice Test Exam
Questions With 100% Verified Answers
If 150 cGy is delivered at a depth of 7.0 cm at 100 cm SSD and the
percent depth dose (PDD) is 65%, the dose at dmax is _____ cGy. -
correct answer ✅231
An attenuation coefficient for a 6 MV beam is 0.94 cm-1. The
thickness of a two (2) half value layer (HVL) block is: -
correct answer ✅1.47 cm
Calculate the dose to the spinal cord at 6 cm depth from a 100cm
SSD PA treatment that has a tumor dose of 90 cGy defined at a
depth of 12 cm.
PDD (fs, 1.5cm) = 100
PDD (fs, 6cm) = 82.1
PDD (fs, 12cm) = 64.1 -
correct answer ✅115 cGy
Calculate the Given Dose of a 100cm SSD treatment with a tumor
dose of 60 cGy prescribed to a depth of 11 cm.
Questions With 100% Verified Answers
The effective field size for a 10x10 field size, with 30% blocked is
approximately how many cm2? -
correct answer ✅8.5
A patient is treated with a 6 MV photon beam, 12.5 x 12.5 cm2 at
110 cm SAD to a 9.0 cm depth. The machine is calibrated to deliver
1.0 cGy per monitor unit at dmax for a 10 x 10 cm2 field at 100SSD.
The number of monitor units required to deliver 150 cGy at the
isocenter is:
TISSUE MAXIMUM RATIO (TMR) FOR 6 MV PHOTONS
Depth (cm) --- 10 x 10 cm2 --- 12 x 12 cm2 --- 14 x 14 cm2
1.5___________________1.0__________________1.0__________
_______1.0
9.0___________________0.810______________0.818__________
____0.824 -
correct answer ✅221
The dose rate at a patient's mid-plane is found to be 250 cGy/min
at 100 cm SAD. A protocol for hemi-body irradiation stipulates that
the dose rate must be no more than 100 cGy/min. At what
minimum SAD must the patient be treated? -
correct answer ✅158 cm
, MDCB Calculations Practice Test Exam
Questions With 100% Verified Answers
If 150 cGy is delivered at a depth of 7.0 cm at 100 cm SSD and the
percent depth dose (PDD) is 65%, the dose at dmax is _____ cGy. -
correct answer ✅231
An attenuation coefficient for a 6 MV beam is 0.94 cm-1. The
thickness of a two (2) half value layer (HVL) block is: -
correct answer ✅1.47 cm
Calculate the dose to the spinal cord at 6 cm depth from a 100cm
SSD PA treatment that has a tumor dose of 90 cGy defined at a
depth of 12 cm.
PDD (fs, 1.5cm) = 100
PDD (fs, 6cm) = 82.1
PDD (fs, 12cm) = 64.1 -
correct answer ✅115 cGy
Calculate the Given Dose of a 100cm SSD treatment with a tumor
dose of 60 cGy prescribed to a depth of 11 cm.
