CT Registry Review March 2010
Questions to prepare for the CT registry.
- 1.Tungsten is used as the target material on the tube's anode because it has a _____ atomic number and a _____ melting point.
- A.
Low, low
- B.
Low, high
- C.
High, low
- D.
High, high
- 2.Using _____ reconstruction filter would decrease the appearance of noise in a CT image.1. no2. a smooth3. a sharp
- A.
1 only
- B.
2 only
- C.
3 only
- D.
2 & 3
- E.
1 & 3
- 3.Which of the following are possible results of partial voluming?1. improvement in resolution2. misleading CT numbers3. decreased sharpness of edges
- A.
1 only
- B.
2 only
- C.
1 & 2
- D.
2 & 3
- E.
1,2 & 3
- 4.Following the HIPAA guidelines, you may give a patient's medical information to another employee:
- A.
If it is in plain sight on the CT console and the employee has already seen it
- B.
Only if it is needed to do their job
- C.
If the employee is related to the patient
- D.
To joke about the patient
- 5.Which of the following is a result of injecting a hypertonic solution into the vascular space?
- A.
There is nothing noteworthy about injecting a hypertonic solution into the vascular space.
- B.
There is a net movement of water out of the vascular space.
- C.
There is a net movement of contrast media out of the vascular space.
- D.
There is a net movement of water into the vascular space.
- 6.Which of the following is NOT a location where one would expect to find cerebral spinal fluid?1. fourth ventricle of the brain2. subarachnoid space3. subdural space
- A.
1 only
- B.
2 only
- C.
3 only
- D.
1 & 3
- 7.Which of the following is a technique used to minimize artifacts from patient motion in exams of the chest?1. patient immobilization devices2. suspended respiration3. shortened scan time
- A.
1 only
- B.
2 only
- C.
3 only
- D.
1,2 & 3
- 8.Which of the following may reduce the out-of-field artifact?
- A.
Increasing the matrix
- B.
Increasing the scan field-of-view
- C.
Reducing the slice thickness
- D.
Reducing the reconstruction field-of-view
- 9.A cone beam artifact may look like stars:
- A.
At the center of the image
- B.
From all structures with high CT numbers
- C.
Coming from structures around the edge of the image
- D.
Coming from cone-shaped structures
- 10.Which the following is NOT contained within the mediastinum?
- A.
Lungs
- B.
Bronchi
- C.
Heart
- D.
Esophagus
- 11.Which scanning plane is best for evaluating the anatomical relationship between the pituitary and the sella turcica?
- A.
Coronal
- B.
Oblique between transverse and sagittal
- C.
Sagittal
- D.
Transverse
- 12.Which of the following is a common patient reaction to IV contrast media?1. warmth at the injection site2. headache3. nausea
- A.
1 only
- B.
2 only
- C.
3 only
- D.
1,2 & 3
- 13.If the mA of a 2 second brain scan is doubled and all other parameters are not changed, the dose is:
- A.
Doubled
- B.
Halved
- C.
Unaffected
- D.
Quadrupled
- 14.Which of the following has the highest patient dose assuming all other parameters are the same?
- A.
MA = 200, rotation time = 2 seconds
- B.
MA = 150, rotation time = 3 seconds
- C.
MA = 200, rotation time = 1 second
- D.
MA = 400, rotation time = 1 second
- 15.A _____ scan uses only a single projection.1. conventional, or serial2. helical3. localizer
- A.
1 only
- B.
2 only
- C.
3 only
- D.
All the above
- 16.______ scanner design was the first to acquire four slices in a single rotation.
- A.
Continuous rotation
- B.
Second-generation
- C.
Third-generation
- D.
Multi-row detector
- 17.The enormous heat that builds up in the CT tube is caused by the:
- A.
Intensity of the x-rays emitted from the tube
- B.
Electron beam between the cathode and the anode in the tube
- C.
Collision of the electron beam with the tungsten target on the tube anode
- D.
X-ray filter in the tube which absorbs the lower energy photons before they can enter the patient
- 18.Which of the following statements is FALSE regarding 3D SSD?
- A.
The volume data, from which the 3D SSD is generated, is created by combining transverse, sagittal, and coronal reconstructions
- B.
Helical image data is well suited for 3D SSD because there is minimal misregistration or gaps
- C.
The tissue surface may be selected by using a threshold value equal to the tissue's CT number
- D.
Patient motion during the scan is detrimental to the quality of the 3D images
- 19.CT numbers _____ would appear black if a window width of 400 and a window level of -100 are used.
- A.
Below -200
- B.
Below -300
- C.
Above +200
- D.
Above +100
- 20.Which of the following is the complete name of the laboratory test known as PTT?
- A.
Thromboplastin time
- B.
Partial thromboplastin time
- C.
Prothrombin time
- D.
Partial prothrombin time
- 21.Lower osmolar contrast media:
- A.
Is never used in CT
- B.
Tends to cause more adverse reactions than high osmolar contrast media
- C.
Typically has a higher concentration of particles compared to blood
- D.
Typically has the same concentration of particles as the blood
- 22.What is the range of anatomy that should be covered for examination of one intervertebral disk space?
- A.
From the pedicle of the vertebra above the disk to the pedicle of the vertebra below the disk
- B.
From the superior articular process of the vertebra above the disk to the superior articular process of the vertebra below the disk
- C.
From the spinous process of the vertebra above the disk to the spinous process of the vertebra below the disk
- D.
From the apophyseal joint above the disk to the apophyseal joint of the vertebra below the disk
- 23.For CT exams of the chest, the patient is usually positioned:
- A.
Head first and decubitus
- B.
Feet first and prone
- C.
Feet first and supine
- D.
Head first and supine
- 24.Which of the following affects beam hardening?1. the energies of the photons in the beam2. the thickness of the tissues traversed by the beam3. the types of tissues the beam passes through
- A.
1 only
- B.
2 only
- C.
3 only
- D.
1,2 & 3
- 25.A CT artifact is:
- A.
A parameter used to control the brightness of the image
- B.
Always a reason to call for repair of the CT scanner
- C.
An anomaly in the CT image
- D.
Used to time the injection of contrast media
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