Exam #2- Word Doc (2) Flashcards
Of the following which would cause a DECREASE in SUBJECT DENSITY?
a. Disuse atrophy
b. Paget’s disease
c. Sclerotic osteosarcoma
d. Fluid in the lung
disuse atrophy
If you INCREASED the mAs and REDUCED the kV from a given radiographic technique what would be the outcome?
a. the film would be underexposed
b. the film would be overexposed
c. the film would have less contrast
d. it would have more contrast
it would have more contrast
To DECREASE the DENSITY of a previously taken film by 1/2 , which would you do?
a. increase the kV by 15%
b. decrease the mAs by 50%
c. increase the mAs by 30%
d. decrease the kV by 50%
decrease the mAs by 50%
If the film is TOO DARK, it is said to be _____.
a. underexposed
b. overexposed
c. under penetrated
d. of good contrast
overexposed
Determine which radiographic technique would have the SHORTEST scale of contrast. (NOT enough gray)
a. 60 kV with 100 mA for 2 sec
b. 70 kV with 300 mA for ½ sec
c. 80 kV with 50 mA for 2 sec
d. 90 kV with 200 mA for ¼ sec
60 kV with 100 mA for 2 sec
lowest kV
About how many kV would be needed to make the SLIGHTEST VISIBLE CHANGE in DENSITY on a radiograph if you were using a single phase unit?
a. 10
b. 7
c. 4
d. 2
4
4 kV / 30% mAs
Which effect would adding 100% more mAs to a radiographic technique have?
a. it would slightly darken the film
b. it would noticeably lighten the film
c. it would double the density of the film
d. it would enhance the contrast on the film
it would double the density of the film
Which of the following best describes what you should expect if you retake an AP lumbar with 15% reduction in the kV and leave the mAs constant?
a. the density of the film would be reduced by 30%
b. the density of the film would be increased by 2/3
c. the density of the film would be reduced by 1/2
d. the density of the film would be increased by 50%
The density of the film would be reduced by ½
If you have a radiograph of the lumbar spine that is noticeably too light but you can see the bones on it and if you deiced to solve your problem by the 15% rule, which would you do?
a. Increase the kV by 15%
b. Decrease the kV by 15%
c. Increase the mAs by 15%
d. Decrease the mAs by 15%
Increase the kV by 15%
OR double the mAs
Which is the recommended optimal kV range for an A-P THORACIC film?
a. 75-85
b. 80-90
c. 85-95
d. 80-100
75-85
Which of the following refers to an ATTENUATION of part of the BEAM by the GRID?
a. grid radius
b. grid factor
c. grid latitude
d. grid cut-off
grid cut-off
If you looked into the port of a used x-ray tube and saw that the entire surface of the ANODE had BUMPS which of the follow terms best matches this appearance?
a. anode melting
b. anode pitting
c. anode overload
d. anode rotation is slow
anode pitting
A FILAMENT does what?
a. reduces heat
b. reduces photons
c. gives off x-rays
d. forms electrons
forms electrons
** In which direction do grid lines run?
a. at right angles to the patient
b. in the long axis of the patient
c. horizontally across the patient
d. diagonally across the patient
in the long axis of the patient
** Which radiographic technique would cause the MOST ABSORPTION of x-rays in a patient’s body?
a. 10 mAs with 140 kV
b. 20 mAs with 90 kV
c. 30 mAs with 60 kV
d. 40 mAs with 40 kV
40 mAs with 40 kV
higher kV, MORE penetration, LESS absorption
What is the most common cause of a BLURRY image in practice?
a. patient motion
b. screen un-sharpness
c. increased in the OFD
d. equipment motion
patient motion
CONTRAST between structures of difference SUBJECT DENSITIES is due to which of the following?
a. differential absorption
b. conversion efficiency
c. spectral matching
d. after glow
differential absorption
Which of the following exposure techniques would have the LOWEST contrast?
a. 200 mAs with 75 kV
b. 150 mAs with 65 kV
c. 100 mAs with 95 kV
d. 50 mAs with 110 kV
50 mAs with 110 kV
LOW contrast = LOW mAs, HIGH kV
Which best describes the effect that SCATTER RADIATION has on a film?
a. it makes the film black
b. it causes graying of the film
c. it causes a graininess to the film
d. it makes the film lighter
it causes a graying of the film
darkens film, decreases clarity and contrast
All other factors being equal which radiographic technique would demonstrate the MOST FILM GRAIN (QUANTUM MOTTLE)?
a. 70 kV with 25 mA for 1 sec
b. 80 kV with 50 mA for ½ sec
c. 90 kV with 100 mA for ¼ sec
d. 100 kV with 200 mA for 1/8 sec
100 kV with 200 mA for 1/8 sec
Too HIGH kV, low mAs
The _____ is the main function of mAs.
a. film contrast
b. film density
c. film speed
d. film latitude
film density
Imagine for a moment that you are a preceptor with a Dr. Haystacks Calhoon a retired professional wrestler who graduated from chiropractic college 30 years ago and has practiced in Onslow, Iowa ever since. You have just taken a lateral cervical film on a new patient named Mr. King Kong Bundy. You see that the finished radiograph is so light that you cannot see any bones at all. Feeling strongly that King Kong must have some bones to help him carry around his enormous head you decide to try another film. Which change in the radiographic technique will probably yield the best possible image of Mr. Bundy’s cervical spine?
a. doubling the mAs
b. increase the kilovolts 15%
c. doubling the mAs and increasing the kilovolts by adding 6
d. increasing the kilovolts by 15% and adding 60% more mAs
e. doubling the mAs and increasing the kilovolts by adding 15% more
Double the mAs and increasing the kilovolts by adding 15% more
You have just associated with Dr. Scrap Iron Gadaski in Cabin John, Maryland just outside of Washington D.C. Dr. Gadaski decides to drive across the Chesapeake Bay to Washington D.C.’s “skid row” to pick up a few street people which he feels will form a patient base for your budding practice. He has managed to persuade five people to get on his clinic bus and ride back to Cabin John. He does the initial exams with you taking notes then he tells you to do a lumbar series on all of them because you need the practice with the x-raying lumbar spines. Scrap Iron demands that you use his variable kV technique so you measure all of them for the A-P view. Below are the patients’ names and measurements from downtown Washington (due to HIPPA requirements the last names have been withheld). Determine the type of radiographic technique the god doctor uses.
a. Millard F measures 30 cm
b. John Q A measures 27 cm
c. H. Ulysses G measures 37 cm
d. S. Grover C measures 47 cm
e. Rutherford H measures 20 cm
Rutherford H _ measures 20 cm
When x-raying an OBESE patient, which of the following would be helpful in obtaining a better quality film?
a. longer exposure time
b. lower kV in the optimal range
c. higher kV in the optimal range
d. shorter tube distance
lower kV in the optimal range
