©SIRJOEL 2024/2025 ALL RIGHTS RESERVED.
RADT 146 Test 3 Exam Questions And
Correct Answers 100% Verified.
What is the primary controlling factor of quality? Secondary? - Answer✔Primary = quality
Secondary = quantity
What controls radiographic contrast? - Answer✔KV
KV and contrast are _________ related - Answer✔Inversely
On the contrast scale, the short scale is _________
The long scale is _________ - Answer✔Short scale = high contrast
Long scale = low contrast
What is the 15% rule? - Answer✔If you increase the KV by 15%, the density of the radiograph is
doubled.
If KV is increased by 15%, then the mAs should be __________ to ___in order to maintain the
same exposure. - Answer✔mAs decreased to 1/2
The higher the KV, the ________ radiation the patient is exposed to because of more penetration
- Answer✔Less
If I want to double the density, I would _______ the KV by _____. What happens to mAs? -
Answer✔Increase KV by 15% , mAs remains the same!
A 15% decrease in KV is the same as ______ - Answer✔1/2 the mAs
MAS controls the _______ of electrons and therefore the x-ray photons - Answer✔Quantity
Double the mAs will double the _______ - Answer✔Exposure (density)
Reciprocity Law - Answer✔states that a particular mAs, regardless of the mA and exposure time
used, will provide identical radiographic density. MAS1=MAS2
Primary controlling factor for quantity is ______ - Answer✔MAs
Intensity of the beam is ___________ to the square of the distance - Answer✔Inversely
proportional
1|Page
, ©SIRJOEL 2024/2025 ALL RIGHTS RESERVED.
Direct. Square law states that ____ is ________________ to the square of the distance -
Answer✔MAs, directly proportional
MAS1/MAS2 = d1squared/d2squared
What are microfocus (fractional) tubes used for and what size are they - Answer✔Magnification
or mammography; .3mm or less fss
What are the size of dual focus tubes - Answer✔.5/1.0mm or .6/1.2mm fss
Larger focal spot size ______ detail (300MA or more)
Smaller focal spot size ________ detail (200 MA or less) - Answer✔Decreases
Increases
Whats the primary purpose of filtration? - Answer✔Reduces patient exposure by absorbing low
level x-ray energy
How does filtration effect quantity of radiation on the image receptor? - Answer✔The more
filtration, the less quantity of radiation (inverse relationship)
How much inherent filtration is there? Added? Total? - Answer✔Inherent = 0,5mm Al
Added = 1.0mm collimator, 1.0 aluminum = 2.0mm Al total ADDED
Total = 2.5mm Al (minimum amount)
As filtration increases, the quality (penetrating power) of the beam _________ -
Answer✔Increases (direct relationship)
What is the advantage of 3phase over single phase power? - Answer✔Shorter exposure times
What is voltage ripple? Less ripple means ______ efficiency - Answer✔= variation in peak
voltage waveform
Greater efficiency
Single phase - ? %
3phase6pulse - ? %
3phase12pulse - ? %
High frequency generator - ? % - Answer✔100%
14%
4%
1%
What are the patient factors considered when choosing a technique - Answer✔Size (body
habitus)
2|Page
RADT 146 Test 3 Exam Questions And
Correct Answers 100% Verified.
What is the primary controlling factor of quality? Secondary? - Answer✔Primary = quality
Secondary = quantity
What controls radiographic contrast? - Answer✔KV
KV and contrast are _________ related - Answer✔Inversely
On the contrast scale, the short scale is _________
The long scale is _________ - Answer✔Short scale = high contrast
Long scale = low contrast
What is the 15% rule? - Answer✔If you increase the KV by 15%, the density of the radiograph is
doubled.
If KV is increased by 15%, then the mAs should be __________ to ___in order to maintain the
same exposure. - Answer✔mAs decreased to 1/2
The higher the KV, the ________ radiation the patient is exposed to because of more penetration
- Answer✔Less
If I want to double the density, I would _______ the KV by _____. What happens to mAs? -
Answer✔Increase KV by 15% , mAs remains the same!
A 15% decrease in KV is the same as ______ - Answer✔1/2 the mAs
MAS controls the _______ of electrons and therefore the x-ray photons - Answer✔Quantity
Double the mAs will double the _______ - Answer✔Exposure (density)
Reciprocity Law - Answer✔states that a particular mAs, regardless of the mA and exposure time
used, will provide identical radiographic density. MAS1=MAS2
Primary controlling factor for quantity is ______ - Answer✔MAs
Intensity of the beam is ___________ to the square of the distance - Answer✔Inversely
proportional
1|Page
, ©SIRJOEL 2024/2025 ALL RIGHTS RESERVED.
Direct. Square law states that ____ is ________________ to the square of the distance -
Answer✔MAs, directly proportional
MAS1/MAS2 = d1squared/d2squared
What are microfocus (fractional) tubes used for and what size are they - Answer✔Magnification
or mammography; .3mm or less fss
What are the size of dual focus tubes - Answer✔.5/1.0mm or .6/1.2mm fss
Larger focal spot size ______ detail (300MA or more)
Smaller focal spot size ________ detail (200 MA or less) - Answer✔Decreases
Increases
Whats the primary purpose of filtration? - Answer✔Reduces patient exposure by absorbing low
level x-ray energy
How does filtration effect quantity of radiation on the image receptor? - Answer✔The more
filtration, the less quantity of radiation (inverse relationship)
How much inherent filtration is there? Added? Total? - Answer✔Inherent = 0,5mm Al
Added = 1.0mm collimator, 1.0 aluminum = 2.0mm Al total ADDED
Total = 2.5mm Al (minimum amount)
As filtration increases, the quality (penetrating power) of the beam _________ -
Answer✔Increases (direct relationship)
What is the advantage of 3phase over single phase power? - Answer✔Shorter exposure times
What is voltage ripple? Less ripple means ______ efficiency - Answer✔= variation in peak
voltage waveform
Greater efficiency
Single phase - ? %
3phase6pulse - ? %
3phase12pulse - ? %
High frequency generator - ? % - Answer✔100%
14%
4%
1%
What are the patient factors considered when choosing a technique - Answer✔Size (body
habitus)
2|Page
