Radiography Flashcards
What portion of the electromagnetic spectrum is used in medical practice?
Iodizing radiation
X-rays occur when a projectile _____ interacts with the K-shell of an electron and removes it from its orbit
Electron
The x-ray tube contains a negative _____ and a positive _____
cathode, anode
When the foot pedal or exposure button is pressed, the negative electrons are rapidly attracted to the positive anode. Electrons are then converted into 99% _____ and 1% x-ray
Heat
The quantity of x-rays that reach the film is the _____ setting
mAs
The penetration power of the x-ray beams is the ______ setting
kVp
What is the MPD in mrem and rem?
5,000 mrem and 5 rem
Where do you measure for Abdominal x-rays?
caudal aspect of 13th rib
Where do you measure for thoracic x-rays? Which view is commonly done alongside lateral for best view of the heart?
Caudal border of scapula. DV is best for heart, VD for lungs
Barium and Iodine are examples of ____ media contrast
positive
Which positive media contrast is best if a GI perforation is suspected?
Iodine. Barium will cause granulomatous reactions if leaked into the abdominal cavity
After giving Barium, at what time intervals should x-rays be taken during an upper GI Barium study?
Immediately, 15 mins, 30 mins, 60 mins, hourly until study is complete
What happens to frequency as wavelength of x-ray increases?
a) increases
b) decreases
c) does not change
d) not a factor when describing x-rays
B
Which best describes ionizing electromagnetic radiation?
a) it is characterized by the energy contained in a photon
b) it occurs only in nature and is not human-made
c) it does not damage tissues
d) it has a wavelength much longer than that of visible light
A
What are not properties of x-rays?
a) they can penetrate living tissue
b) they can cause some substances to fluoresce
c) they form a homogenous beam that travels in wavy lines
d) they are electrically neutral and dont have a mass
C: x-rays form a heterogenous beam
In the diagnostic range, most x-rays are:
a) bremsstrahlung radiation
b) Braking radiation
c) characteristic radiation
d) A and B
D
Which of the following controls the contrast on the image?
a) mAs
b) kV
c) SID
d) RAD
B: kV (kilovoltage)
Exposure factors for a thorax are 10 mAs and 60 kV. The film density is too light, and the technician wants to double the density. What technique should be used for the radiograph?
a) 200 mA, 0.1sec, 60 kV
b) 150 mA, 0.1 sec, 60 kV
c) 100 mA, 0.2 sec, 69 kV
d) 300 mA, 0.3 sec, 69 kV
A: when film density is too light and exposure time is the suspect, doubling density from 10 to 20 means a change to 200 mA per 0.1 second
To minimize magnification and penumbra, a technician should ____ the sourceimage distance and ____ the source object distance
a) increase, decrease
b) increase, increase
c) decrease, increase
d) decrease, decrease
A
The heel effect is going to be less noticeable with:
a) larger film and shorter SID
b) larger film and longer SID
c) smaller film and shorter SID
d) smaller film and longer SID
D
