Fluoro exam Flashcards
(43 cards)
During a fluoro exam knowledge of _____ can ensure the lowest dose whole achieving diagnostic image?
optimal exposure factors
_____ is the measure of tube potential
kVp
Increase kVp results in?
- lower pt. dose
- Decrease in ESE
- Decrease subject contrast
- Increase radiate dose at input phosphor
x-ray output is directly proportional to____?
mA
____ is the quality of the beam
while ___ is the intensity of the beam
- kVp
2. mA
Image quality will improve with ____?
well collimated areas
Will image brightness increase with enlarged FOV?
no
Increase in mA results in?
- Brighter image
- Increased pt. dose
- Increase operator dose
Increased collimation results in?
- Decrease pt .dose
- Increase image quality
- Decrease integral dose
_____ is the total of energy from the beam absorbed by the patient
Integral dose
unit= gram rad
What is the unit of integral dose
gram rad
1 gram = 100 ergs
material placed in the primary beam to absorb less penetrating x-ray photons is known as?
filtration
What is the main purpose of filtration
reduce the # and amount of low energy (long wavelength) x-rays from reaching the patient
Inharent & added filtration = ____ for fluoro operating at normal ( 80-120) kV
at least 2.5 mm Al
Inharent & added filtration = ____ for fluoro operating up to 150 kV
at least 3 mm Al
Filtration results in?
- Decrease scatter radiation
- Increased image quality
Thickness of absorbing material necessary to reduce the x-ray beam intensity to half the original value
HVL
What defines the quality of the x-ray beam
HVL
Exposure Time—should always be kept to a _____
minimum
Manual reset timer may not exceed ___ min.
5 min
Allowable exposure rates may not exceed ___ per minute
10 rads / min
Allowable exposure rates amount to ____ /____ per each mA
2.1 / 2.2
For units with ABC/AEC the operator must do a quality control check of kVp and mA _____?
once each week
What does TPD stand for? What is it?
Target to panel distance
- Applies to mobile fluoro
- ESE should range 12-18”
