LXMO Exam Questions With Correct
Answers
Rectification Constant - answerA value of the heat unit formula that varies depending on the
generator used.
Generators used in Radiography - answersingle phase generator delivers pulsating x-ray
beam (1), Three phase generator = 3 phase 6 pulse machine...
BRIGHTSTARS EXAM STUDY SOLUTIONS 8/15/2024 2:05 PM
LXMO Exam Questions With Correct
Answers
Rectification Constant - answer✔✔A value of the heat unit formula that varies depending on the
generator used.
Generators used in Radiography - answer✔✔single phase generator delivers pulsating x-ray
beam (1), Three phase generator = 3 phase 6 pulse machine (1.35) , High frequency generator =
3 phase 12 pulse machine (1.41)
Rectification - answer✔✔The rectifier of the x-ray tube changes alternating current (AC) to
direct current (DC). This process ensures that the x-ray production flows in the right direction;
from the filament to the target.
Heat Unit (HUs) Formula - answer✔✔KVP x MA x Time x (rectification constant) = HUs
Cumulative MPD - answer✔✔Cumulative Maximum Permissible Dose is the total amount of
radiation that an x-ray worker could have been exposed to since the age of 18 according to
NCRP (National Council on Radiation protection.)
Cumulative MPD Formula - answer✔✔CMPD = 5 (N-18) The "N" in the equation refers to the
current age of the worker, always subtract 18 from the current age before multiplying by 5. 5
refers to the number of REMS per year that is max for worker.
Inverse square law - answer✔✔The closer you are to the source of radiation, the more exposure
you will receive and vice-versa. As distance increases, exposure decreases; as distance decreases,
exposure increases.
Inverse square law formula - answer✔✔i1/ i2 = (D2)2 / (D1)2 i2 will be the unknown (x). To
make it easier to solve, square the values first the cross multiply and divide.
Ampere "A" - answer✔✔Unit used to measure the rate, or volume, of current flow in the circuit.
X-ray circuit contains 0.3 A
Potential Difference - answer✔✔Is the force or speed of the electron flow in the current. The
volt "V" is used to measure the potential difference. x-ray circuit contains 120,000V
Diode - answer✔✔Allows electrons to flow only in one direction.
, BRIGHTSTARS EXAM STUDY SOLUTIONS 8/15/2024 2:05 PM
Transformer - answer✔✔Increases or decreases voltage by fixed amount (AC only)
Sine wave - answer✔✔Energy expressed in a recurring wave-form.
Wavelength - answer✔✔The distance from crest to crest in a sine wave
Frequency - answer✔✔The number of times per second that a crest passes a given point.
Kilovoltage (Kvp) - answer✔✔Voltage is measured at the peak of the electric cycle. Kvp
controls the energy (wavelengths) or penetrating power of x-ray beam. X-rays with shorter
wavelengths have more power.
Anode Heel effect - answer✔✔Uneven distribution of radiation intensity in the x-ray beam. X
rays that are directed away from the cathode are more likely to be absorbed than those directed
toward it.
Actual focal spot - answer✔✔Area on the target surface that is struck by the electron steam.
Effective focal spot - answer✔✔Refers to the vertical projection (which will vary based on
degree of angulation) of the actual focal spot onto the patient and image receptor. The size of the
effective focal spot influences the resolution in the image.
Focal Spot - answer✔✔Precise area on the target
Bremsstrahlung radiation - answer✔✔"brems" braking or slowing Interactions that occur within
the anode which result in production of photons. Below 70 kvP, 100% of photons in x-ray beam
are from brems. Above 70 kvP, about 85% of the beam is brems.
Photon - answer✔✔small bundle of electromagnetic energy
Kiloelectron volts (keV) - answer✔✔X-ray energy is measured in kiloelectron volts
Characteristic Radiation - answer✔✔Below 70 kvP, there are no characteristic photons produce,
above 70 kvP, about 15% of the beam is characteristic. Wavelength and energy of the beam is
heterogeneous.
Wilhem Conrad Roentgen - answer✔✔Discovered x-rays in 1895
Date of x-ray discovery - answer✔✔November 8, 1895
American Society of Radiologic Technologist (ASRT) - answer✔✔World's oldest and largest
professional radiologic science organization. Discovered in Chicago 1920.It offers many services
to its members including continuing education, annual national meeting and professional
newsletter.
American Registry of Radiologic Technologists (ARRT) - answer✔✔Formed in 1922 to
establish standards and examination necessary to certify registered technologists (radiography).
The benefits of buying summaries with Stuvia:
Guaranteed quality through customer reviews
Stuvia customers have reviewed more than 700,000 summaries. This how you know that you are buying the best documents.
Quick and easy check-out
You can quickly pay through credit card or Stuvia-credit for the summaries. There is no membership needed.
Focus on what matters
Your fellow students write the study notes themselves, which is why the documents are always reliable and up-to-date. This ensures you quickly get to the core!
Frequently asked questions
What do I get when I buy this document?
You get a PDF, available immediately after your purchase. The purchased document is accessible anytime, anywhere and indefinitely through your profile.
Satisfaction guarantee: how does it work?
Our satisfaction guarantee ensures that you always find a study document that suits you well. You fill out a form, and our customer service team takes care of the rest.
Who am I buying these notes from?
Stuvia is a marketplace, so you are not buying this document from us, but from seller Brightstars. Stuvia facilitates payment to the seller.
Will I be stuck with a subscription?
No, you only buy these notes for $10.49. You're not tied to anything after your purchase.
