Important Info 2.3 Flashcards
List 2 examples of inherent filtration
a. Glass envelope
b. Insulating/immersion oil
c. Tube window
d. Metal housing
What occurs when you have a low kV?
High gray scale
Inverse Square law question. If you double it, what happens?
Intensity of the beam is 1/4 the original
By using adjustment tools such as “Edge enhancer”, can you stimulate illnesses and abnormalities to show that are not actually there?
Yes
Too much information on computer can cause
Not function properly
Which of the following has the most biological effects?
a. Indirect (⅔)
Which of the following factors modify effects of X-radiation?
a. Increased oxygen content
b. Pediatric patients
What stage of acute radiation syndrome is non-lethal?
Prodromal period
What is the most lethal stage of acute radiation syndrome?
CNS and cardiovascular syndrome
What is the effect of radiation on teeth?
Radiation caries
What kind of radiation causes radiation caries?
Indirect
What are the occupational limits?
5 rem or 50 mSv
What are the pregnancy occupational limits?
0.5 rem or 500 eREM
What kind of X-rays do you take on a pregnant patient?
Only take x-rays during emergency circumstances
What are examples of background radiation?
Radon
(Select all that applies) What cancer has the highest risk for dental radiograph exposure?
a. Leukemia
b. Thyroid
Where should you stand when taking an x-ray?
Behind barrier, 6 feet away, 90-135 degree from beam
(Shows picture of a Water’s skull) What is the primary reason for taking this kind of image?
See the maxillary sinus
According to the SLOB rule, when you move the tube head mesially, and the object also moves
mesially, where is it located?
Lingual
(Fill in the blank) What comprises the Inverted Y?
a. Nasal fossa
b. Maxillary sinus
Do you need to wear a lead apron?
No ← he said recent evidence shows that it is useless
Which of the following provides the best protection against radiation?
Lead thyroid collar ← only answer the made sense
This is when the tooth is not parallel to receptor, and beam directed perpendicular to receptor
Foreshortening
This when tooth is not parallel to receptor, and beam directed perpendicular to tooth
Elongation
If you shorten Source-to-receptor, what happens?
a. Increase sharpness
b. Decrease magnification
c. Decrease sharpness
d. Increase magnification
e. Both A and C
f. Both C and D
f. Both C and D
What ionization has the most effect?
a. Compton scattering
b. Photoelectric
c. Coherent
d. No interaction
a. Compton scattering
A lady has colon cancer and thus had radiation treatment. However, her 2 children are at increased risk. This affected _____
Germ cells
What is the most lethal part of hematopoietic syndrome?
Sepsis
The effect is only seen in the person affected, NOT future generations
Somatic
By federal law, a signal and light are required on every x-ray unit
True
How many Gy is needed for treatment of lymphoma?
20-40 Gy
-solid tumors: 60-80 Gy
-intraoral cancer 50 Gy
Operating Kv is <50, what size filtration do you need?
0.5mm
Full time X-ray operator needs to have what on their person at all times?
Dosimeter
In X-radiation, absorbed dose is _______ to equivalent dose
a. Equal
b. Less
c. More
a. Equal
In X-radiation, the absorbed dose is ______ to the effective dose
a. Equal
b. Less
c. More
b. Less
If you increase mA, what occurs?
Increased density
Alpha particles have ________ charge and a _______ LET then a proton
Larger; larger
This reduces the amount of scatter radiation exposing film
Grid
standard maxillary cross-sectional occlusal radiograph
frontal sinus
anterior border of ramus
- in our slides as the external oblique ridge
mental ridge
internal oblique ridge
mental foramen
mental fossa
nasolacrimal canal
floor of the maxillary sinus
soft tissue of the nose
zygomatic process of the maxilla
maxillary tuberosities
pterygoid plate
