The line-focus principle refers to the fact that
1. x-rays cannot be focused
2. the effective focal spot is larger than the actual focal spot
3. x-rays travel in straight lines
4. the actual focal spot is larger than the effective focal spot
4
To eject a K-shell electron from a tungsten atom, the incoming electron must have an energy of at least 1.60 keV. 2.70 keV. 3.80 keV. 4.90 keV.
2
The NCRP recommends a total equivalent dose limit to the embryo/fetus of__ mSv (___ mrem, 0.5 rem).
5
500
Backscatter on a digital image can cause an artifact called a
Phantom image artifact
The instrument that is used frequently in quality-control programs to measure varying degrees of x-ray exposure is the
densitometer.
A drug's chemical name is called its
A
All the following are part of the Patient's Bill of Rights except 1
A the right to participate in proposed research studies.
B the right to continuity of care.
C the right to considerate and respectful care.
D the right to review any institutional records.
d
Place the following anatomic structures in order from anterior to posterior:
1.Trachea
2.Apex of heart
3.Esophagus
D Apex of heart, esophagus, trachea
C
The Centers for Disease Control and Prevention (CDC) suggests that health care workers protect themselves and their patients from blood and body fluid contamination by using
A strict isolation precautions.
B standard precautions.
C respiratory precautions.
D sterilization
b
When radiographing young children, it is helpful to
1.let them bring a toy.
2.tell them it will not hurt.
3.be cheerful and unhurried.
A 1 only
B 1 and 3 only
C 2 and 3 only
D 1, 2, and 3
b
During an upper gastrointestinal (GI) examination, the AP recumbent projection of a stomach of average shape will usually demonstrate
1.anterior and posterior aspects of the stomach.
2.barium-filled fundus.
3.double-contrast body and antral portions.
A 1 only
B 1 and 2 only
C 2 and 3 only
D 1, 2, and 3
c
In which of the following examinations would a cassette front with very low absorption properties be especially important?
D
Which of the following is considered the unit of exposure in air?