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What is PDD dependant on?
field size, energy & ssd
- PDD is directly proportional to field size, energy & ssd
- PDD is inversely proportional to depth
The cells at the center of the tumor tend to be
When a field size changed during the course of treatment which is true:
A) treatment dose must change
B) physician must include changes on prescription
C) the mu or time must be recalculated
all of the above
what is grading used for?
- to indicate degree of differentiation
- (cell differentiation)
What is a constant error in treatment called?
Half does it: stay the same; increase; decrease
as the source decays
Stays the same (it is a constant value)
Suprasternal notch is at what vertebral level?
How thick of a block is needed for electron blocks?
Which brain tumor mets to the spine
When a patient gets a new field, what is the best way to keep record
Take pics of field drawn out
List Lhermittes syndrome symptoms
Electric shocks down the back & limbs, especially when the patient tilts his head forward
**This is a sign for laryngeal cancer**
Understand elapsed days.....
the first day of treatment is day zero
- 4mv: 1.0cm
- 6mv: 1.5cm
- 10mv: 2.0 cm or 2.5cm
- 18mv: 3.5 cm
What is the most sensitive cell cycle?
What do you do if the video goes out
How do you get dose from a TLD?
Heat it & measure the light given off by the LiFl crystals as a reference of how much radiation was received
What hazardous material is used in cerrobend blocks?
Cadmium & Lead
Why would you treat bladder cancer with an empty bladder?
To reduce the size of the bladder & keep the field as small as possible
What is a beam spoiler used for?
Reduce depth of D-max
What is the best way to diagnosis a brain tumor
MRI (better with soft tissue)
You are treating with 9MeV electrons 1cm bolus
Where is the location of 100% of the dose
Which is not a method of IMRT?
cone beam; IMRT, step & shoot, 3D conformal
What is the lung density compared to water
0.25 - 0.33
Best way to determine that a patient went into cardiac arrest
chest pain - shortness of breath - pallor - no pulse
What is the lymph drainage of the Larynx?
subdigastric & submaxillary