TEST PREP B-12 Flashcards
(100 cards)
How are LET and biologic response (RBE) related?
- They are inversely related
- They are directly related
- They are related in a reciprocal fashion
- They are unrelated
They are directly related
A graphic representation of signal values representing various absorbing properties within the part being imaged is called a
- processing algorithm
- DICOM
- histogram
- window
histogram
The term dysplasia refers to
- difficulty speaking
- abnormal development of tissue
- malposition
- difficult or painful breathing
abnormal development of tissue
A positive contrast agent
- absorbs x-ray photons
- is composed of elements having high atomic number
- is seen as a dark area on the image
- 1 only
- 1 and 2 only
- 2 and 3 only
- 1, 2, and 3
1 and 2 only
The quality that is reflective of dose and the volume of tissue exposed is
- R in air
- absorbed dose
- dose area product
- entrance skin exposure
dose area product
Proper body mechanics includes a wide base of support. The base of support is the portion of the body
- in contract with the floor or other horizontal surface
- in the midportion of the pelvis or lower abdomen
- passing through the center of gravity
- none of the above
in contract with the floor or other horizontal surface
The femorotibial articulation shown below could be better demonstrated by
- rotating the patient forward
- rotating the patient backward
- angling the central (CR) about 5o caudad
- angling the CR about 5o cephalad
angling the CR about 5o cephalad
Which of the following types of adult tissue cells are considered radiosensitive?
- Brain cells
- Epithelial tissue
- Nerve cells
- Muscle cells
- Intestinal crypt cells
- Lymphocytes
- 1, 4, and 6
- 2, 5, and 6
- 1, 4, and 5
- 2, 3, and 4
- 3, 5, and 6
2, 5, and 6
Geometric unsharpness will be least obvious
- at long SIDs
- with small focal spots
- at the anode end of the image
- 1 only
- 1 and 2 only
- 2 and 3 only
- 1, 2, and 3
1, 2, and 3
Which of the dose-response curves shown in figure below illustrate(s) a threshold dose?
- Curve number 1
- Curve number 2
- Curve number 3
- 1 only
- 2 only
- 1 and 3 only
- 2 and 3 only
2 and 3 only
The carpal scaphoid can be demonstrated in which of the following projection(s) of the wrist?
- PA oblique
- PA with radial deviation
- PA with elbow elavated 20 deg
- 1 only
- 1 and 2 only
- 1 and 3 only
- 1, 2, and 3
1 only
Dorsal decubitus projectins of the chest are used to evaluate small amounts of
- fluid in the posterior chest
- air in the posterior chest
- fluid in the anterior chest
- 1 only
- 1 and 2 only
- 2 and 3 only
- 1, 2, and 3
1 only
Which of the following is a functional study used to demonstrate the degree of AP motion present in the cervical spine?
- Moving mandible position
- AP open-mouth projection
- Laterals in flexion and extension
- AP right and left bending
Laterals in flexion and extension
Which of the following is/are evaluation criterion/criteria for a PA chest radiograph of the heart and lungs?
- Ten pairs of posterior ribs should be seen above the diaphragm
- The medial ends of the clavicles should be equidistant from the vertebral cloumn
- The scapulae should be seen through the upper lung fields
- 1 only
- 1 and 2 only
- 2 and 3 only
- 1, 2, and 3
1 and 2 only
Select the correct statements regarding the structure indicated by the number 7 in Figure below.
- It represents the glass envelope
- It absorbs scattered radiation
- It is lead-lined
- It decreases leakage radiation
- It represents the tube housing
- It “hardens” the x-ray beam
- 1, 2, and 3
- 2, 4, and 6
- 3, 4, and 5
- 3, 5, and 6
- 4, 5, and 6
3, 5, and 6
Which of the following is a fast-acting vasodilator used to lower blood pressure and relieve the pain of angina pectoris?
- Digitalis
- Dilantin
- Nitroglycerin
- Cimetidine (Tagamet)
Nitroglycerin
Technical factors of 80 kV and 8 mAs are used for a particular nongrid exposure. What should be the new milliampere seconds value if an 8:1 grid is added?
- 16 mAs
- 24 mAs
- 32 mAs
- 40 mAs
32 mAs
Which of the following statements is/are true with regard to the two CT images seen in figure below?
- Figure A illustrates more superior structures
- The images are sagittal reconstructions
- The examination was performed without artificial contrast
- 1 only
- 1 and 3 only
- 2 and 3 only
- 1, 2, and 3
1 only
The structure labeled number 7 in Figure B is the
- IVC
- aorta
- spleen
- left kidney
aorta
An illness of unknown or obscure cause is said to be
- systemic
- epidemic
- idiopathic
- pathogenic
idiopathic
The annual dose limit for occupationally exposed individuals is valid for
- alpha, beta, and x-radiations
- x- and gamma radiations only
- beta, x-, and gamma radiations
- all ionizing radiations
beta, x-, and gamma radiations
The sampling frequency in CR is expressed as
- pixel density
- the relationship between focal spot and matrix sizes
- light spread between the IP and the light guide of the scanner
- TFT array size
pixel density
Features of digital fluoroscopy (DF) that contribute to patient dose reduction include
- last-image hold
- pulsed exposure
- longer procedure times
- 1 only
- 1 and 2 only
- 2 and 3 only
- 1, 2, and 3
1 and 2 only
Which of the following is the approximate skin dose for 5 min of fluoroscopy performed at 1.5 mA?
- 31.5 mGy
- 105 mGy
- 157 mGy
- 210 mGy
157 mGy