CT Registry Review Hh
The ct registry review program
- 1.On a multi-row detector scanner, radiation penumbra may be found:
- A.
On every other slice
- B.
Only on the trailing edges of the slices
- C.
On every slice
- D.
Only on the first and last slices of the slice volume
- 2.What is normal blood presure values for adult systolic
- A.
90-140
- B.
75-90
- C.
80-110
- D.
70-100
- E.
60-90
- 3.What is the normal blood presure values for adults diastolic
- A.
60-90
- B.
70-85
- C.
85-100
- D.
75-90
- E.
50-75
- 4.The average adult pulse rate rages
- A.
50-85
- B.
65-95
- C.
65-100
- D.
80-110
- E.
70-100
- 5.The average pulse rate for an infant ranges
- A.
90-100
- B.
45-95
- C.
100-180
- D.
110-120
- E.
120-200
- 6.On a single -row detector scanner, which of the following does not decrease the pt dose
- A.
Decreasing the scan time while leaving the mA constant
- B.
Decreasing the slice thickness while covering the same anatomical region
- C.
Reformat the data instead of rescanning
- D.
Increasing the pitch
- 7.Blood urea nitrogen level of ---mg/dl is considered outside the normal range
- A.
10
- B.
18
- C.
32
- 8.If there is no overlap or gabetween adjacent slices of a ct scan, CTDI-----MSAD
- A.
IS LESS THAN
- B.
EQUALS
- C.
IS MUCH GREATER THAN
- D.
IS SLIGHTLY GREATER THAN
- 9.WHICH OF THE FOLLOWING REDUCES PATIENT DOSE AT THE EXPENSE OF INCREASING TTHE APPARENT NOISE IN THE IMAGE
- A.
KVP
- B.
PITCH
- C.
TABLE INCREMENT
- D.
MAS
- 10.------------------scanner design was the first to acquire four slices in a single rotation
- A.
Second-generation
- B.
Third generation
- C.
Multi-row detector
- D.
Continuous rotation
- 11.Which of the following is a component not normally located in the gantry of a modern ct system
- A.
Pre-patient collimator
- B.
Solid-state detectors
- C.
Array processor
- D.
X-ray tube
- 12.Bremsstrahlung radiation does not include which type of electron activity
- A.
Collision btw an incoming electron and the nucleus of the target atom
- B.
Collision btw an incoming electron and an electron in an inner shell of the target atom
- C.
Slowing down of an incoming electron due to the effect of passing close to the positive charge of the nucleus of the target atom
- 13.Which of the following statement is FALSE regarding occurrences after an x-ray photon penetrates the detector aperture
- A.
The photon can pass through the detector unmeasured
- B.
The photon is conveted completely into an electron
- C.
The measured signal is enhanced by an emplifier
- 14.Ct images can be directly scanned in planes other than transverse by
- A.
Orienting the pt body part so that it is not perpendicular to the xpray beam
- B.
Tilting the gantry
- C.
Changing the angle that the x-ray beam leaves the tube
- 15.Which of the following is false about the spatial resoultion of an image?
- A.
Resolution is dependent on matrix size
- B.
Resolution is dependent on reconstruction FOV
- C.
Resolution is dependent on scanned FOV
- 16.If the slice thickness is changed from 5mm to 7mm and all other parameters are held constant,-----% more photons will be used inmaking the slice
- A.
30
- B.
40
- C.
60
- D.
60
- E.
80
- 17.If a reconstruction FOV of 32 cm and a 512 x 512 matrix are used, the pixel size is ----mm
- A.
0.35
- B.
0.625
- C.
1.6
- D.
3.25
- 18.Which of the following does not occure when reconstruction FOV is decreased
- A.
Spatial resolution is increased
- B.
Pixel size is increased
- C.
Noise in the image increases
- 19.The smalles object that can be resolved if a reconstruction FOV of 24 cm and a 512 x 512 matrix are used is ------mm
- A.
0.47
- B.
1.00
- C.
2.13
- D.
3.57
- 20.If the radiologist requires 2mm thick contiguous slices through the pituitary, and 2.4 cm of coverage,----slices are necessary?
- A.
8
- B.
10
- C.
12
- D.
13
- 21.Which of the following is not a result of reducing the reconstruction FOV?
- A.
Improved spatial resolution
- B.
Increased appearance of image noise
- C.
Anatomical structures appear smaller
- 22.150mm FOV a wecond 300mm FOV which of the following statements is false
- A.
The second set resoulution is better than the first set
- B.
Noise in the second set more pronounced than first set
- C.
Pt dose of the first set higher than the second set
- 23.Which of the following parameters causes helical slices to be reconstructed so they overlap
- A.
Table increment
- B.
Reconstruction interval
- C.
Pitch
- D.
Collimation
- 24.Which of the following can be changed retrospectively?
- A.
Slice thickness from an MDCT helical scan
- B.
The slice overlap from a single row detector scanner helical scan
- C.
The slice thickness from a single-row detector scanner helical scan
- 25.Which of the following values for pitch would stretch the x-ray helix the most?
- A.
1.0
- B.
1.5
- C.
0.5
- D.
0.8
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