RTE 1401 Exam 1 Review (2026-2027
Update) with Frequently Tested
Questions and Precise Answers / Fully
Solved / Already Rated A+
When were x-rays discovered and by who?
Nov. 8 , 1895 by Wilhelm Conrad Roentgen
First radiograph
Roentgen's wife's hand in Dec. 22, 1895
X was the term representing unknown
Exposure times were commonly
20 mins -2 hours
acute radiodermatitis
radiation burns
Thomas Edison brought attention to the dangers of x-rays
First person who died from x-rays
Edison's assistant Clarence Dally (1904)
Fluoroscope
device used for dynamic radiographic examinations using x-rays
and a fluorescent screen
Ionization
removal of an electron
Fundamental Qualities
mass, length, time
derived quantities
velocity, acceleration, force, momentum, work, and power
radiologic quantities
dose, dose equivalent, exposure, and radioactivity
Si uses
Kilogram to quantify mass, the meter for length and the second to
measure time
The SI uses kilogram to quantify mass and the kilogram is based
on the mass of 1000 cubic centimeters of water at 4 degrees C
, Mass
the amount of matter in an object; matter occupies space, has
shape or form and has mass
speed of light
3.00 x 10^8 m/s or 186,000 meters per second
Velocity
the speed and direction of a moving object
Formula: v=d/t
Unity of measure is Meters per second (m/s)
Fundamental qualities length and time are used
Acceleration
Change in velocity divided by the time it takes for the change to
occur
Primary barrier
a shielding structure that can be struck by the primary x-ray beam
exiting the x-ray tube
Ex: wall behind up right Bucky & beneath x-ray table
1/16 inch of lead
Secondary Barriers
protect from secondary (scattered and leakage) radiation.
Secondary barriers are control booths, lead aprons, door, and the
wall of the x-ray room above 7 feet.
1/32 inch of lead
Primary tool for beam restriction
Collimator
Radiographers controls usage of kVP, mAs, and SID
Low kVp increases radiation dose
Increase kVp less absorption, rescues radiation dose to patient
15% rule
A 15% increase in kVp can reduce mAs by one half & still maintain
image quality
ALARA principle
As Low As Reasonably Achievable
Time, distance, shielding
Distance most effective
Collimating reduces radiation for patient
Increase collimation, decrease patient dose and increase image
quality
mobile x-ray
C-arm
permanently installed equipment consists of
tube, collimator, table, control console, tube stand, and wall unit
Update) with Frequently Tested
Questions and Precise Answers / Fully
Solved / Already Rated A+
When were x-rays discovered and by who?
Nov. 8 , 1895 by Wilhelm Conrad Roentgen
First radiograph
Roentgen's wife's hand in Dec. 22, 1895
X was the term representing unknown
Exposure times were commonly
20 mins -2 hours
acute radiodermatitis
radiation burns
Thomas Edison brought attention to the dangers of x-rays
First person who died from x-rays
Edison's assistant Clarence Dally (1904)
Fluoroscope
device used for dynamic radiographic examinations using x-rays
and a fluorescent screen
Ionization
removal of an electron
Fundamental Qualities
mass, length, time
derived quantities
velocity, acceleration, force, momentum, work, and power
radiologic quantities
dose, dose equivalent, exposure, and radioactivity
Si uses
Kilogram to quantify mass, the meter for length and the second to
measure time
The SI uses kilogram to quantify mass and the kilogram is based
on the mass of 1000 cubic centimeters of water at 4 degrees C
, Mass
the amount of matter in an object; matter occupies space, has
shape or form and has mass
speed of light
3.00 x 10^8 m/s or 186,000 meters per second
Velocity
the speed and direction of a moving object
Formula: v=d/t
Unity of measure is Meters per second (m/s)
Fundamental qualities length and time are used
Acceleration
Change in velocity divided by the time it takes for the change to
occur
Primary barrier
a shielding structure that can be struck by the primary x-ray beam
exiting the x-ray tube
Ex: wall behind up right Bucky & beneath x-ray table
1/16 inch of lead
Secondary Barriers
protect from secondary (scattered and leakage) radiation.
Secondary barriers are control booths, lead aprons, door, and the
wall of the x-ray room above 7 feet.
1/32 inch of lead
Primary tool for beam restriction
Collimator
Radiographers controls usage of kVP, mAs, and SID
Low kVp increases radiation dose
Increase kVp less absorption, rescues radiation dose to patient
15% rule
A 15% increase in kVp can reduce mAs by one half & still maintain
image quality
ALARA principle
As Low As Reasonably Achievable
Time, distance, shielding
Distance most effective
Collimating reduces radiation for patient
Increase collimation, decrease patient dose and increase image
quality
mobile x-ray
C-arm
permanently installed equipment consists of
tube, collimator, table, control console, tube stand, and wall unit
