CT Basics
Computed tomography review
- 1.
All human tissues and organs originates from primary germ layers.which germ layer forms the central nervous system
- A.
Endoderm
- B.
Macroderm
- C.
Mesoderm
- D.
Ectoderm
Correct Answer
D. Ectoderm -
- 2.
Which cranial nerve has the widest distribution
- A.
Trigeminal
- B.
Hypoglossal
- C.
Vagus
- D.
Glossopharyngial
Correct Answer
C. VagusExplanation
helps regulate heart, brathing, and digestionRate this question:
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- 3.
What is an important funtion of the choroid plexus
- A.
Separates the cerebral hemispheres
- B.
To protect the brains surface
- C.
To produce cerebral spinal fluid
- D.
To provide comunication between right and left cerebellum
Correct Answer
C. To produce cerebral spinal fluid -
- 4.
The normal range of respiration for an adult is
- A.
5-10 breaths per minute
- B.
12-20 breaths per minute
- C.
20-30 breaths per minute
- D.
35-50 breaths per minute
Correct Answer
B. 12-20 breaths per minute -
- 5.
Which of the following is a parenteral route of medication administration
- A.
Sublingual
- B.
Intramuccular
- C.
Transdermal
- D.
Oral
Correct Answer
B. IntramuccularExplanation
parenteral routes include intramuscular, intravenous, intradremal and subcutaniousRate this question:
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- 6.
The preparation for a contrast ct exam of a patient with a prior alergic reaction may include
- A.
Premedication with steroids and antihestamines
- B.
A negative contrast agent
- C.
Increase of fluid intake for 24 hours
- D.
Refraining from urinating for 2 hours before the test
Correct Answer
A. Premedication with steroids and antihestamines -
- 7.
A common injection site for contrast would be
- A.
Cephalic vein
- B.
Antecubital vein
- C.
Basilic vein
- D.
All of the above
Correct Answer
D. All of the above -
- 8.
Which of these technical factors would directly effect patient dose
- A.
Matrix size
- B.
Algorithm
- C.
Mas
- D.
Window level
Correct Answer
C. Mas -
- 9.
Preleminary questions before injection of iv contrast would include1. renal function2. allergic history3 cardiac history
- A.
1 only
- B.
1 and 2 only
- C.
3 only
- D.
1, 2, and 3
Correct Answer
D. 1, 2, and 3 -
- 10.
The term__________ refers to the number of ions formed when a substance disassociates in solution. it is used to determine the biological effects of iv contrast
- A.
Concentration
- B.
Osmolality
- C.
Solubility
- D.
Iodination
Correct Answer
B. Osmolality -
- 11.
Which of the following lab values can be used to eval renal function
- A.
Bun
- B.
Creatinine
- C.
Ptt
- D.
A&b
Correct Answer
D. A&b -
- 12.
An infection a patient aquires during their hospital (common to that hospital) stay is called
- A.
Blood-borne
- B.
Nosocomial
- C.
Iatrogenic
- D.
Staphylococcal
Correct Answer
B. Nosocomial -
- 13.
A contrast material that does not dissassotiate into charged particles in solution is called
- A.
Neutral
- B.
Non ionic
- C.
Osmolar
- D.
Ionic
Correct Answer
B. Non ionic -
- 14.
The average range for adult bun levels is
- A.
1-4 mg/dl
- B.
5-20 mg/dl
- C.
23-30 mg/dl
- D.
45-60mg/dl
Correct Answer
B. 5-20 mg/dl -
- 15.
A condition in which cerebral ischemia is caused by systemic hypotention
- A.
Vasovagal reaction
- B.
Myocardial infarction
- C.
Transient ischemic attack
- D.
Hydrocephalus
Correct Answer
A. Vasovagal reactionExplanation
the term vasovagal pertains to systemic hypotention which often leads to cerebral ischemiaRate this question:
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- 16.
Which interaction between xray beam and matter results in the largest pt. dose
- A.
Characteristic
- B.
Compton's scatter
- C.
Bremsstrahlung
- D.
Photoelectric effect
Correct Answer
D. Photoelectric effectExplanation
during the photoelectric interaction the pt. completely absorbs the energy of the xrayRate this question:
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- 17.
What is a common medication used to sedate small children in order to do a ct exam
- A.
Chloral hydrate
- B.
Lithium
- C.
Diazipam(valium)
- D.
Secobarbital sodium
Correct Answer
A. Chloral hydrate -
- 18.
The purpose of iv contrast adminisration is
- A.
Increase the contrast of adjacent structures
- B.
Increase beam attenuation of enhanced structures
- C.
Increase the cost to the patient
- D.
A and b
Correct Answer
D. A and b -
- 19.
The adult spinal cord ends at what vertebral level
- A.
L1-2
- B.
Ll3-4
- C.
L5
- D.
Superior portion of the coccyx
Correct Answer
A. L1-2 -
- 20.
The portion of the nephron that filters waste material from the blood plasma is
- A.
Afferent arteriole
- B.
Proximal tubule
- C.
Efferent arteriole
- D.
Glomerulus
Correct Answer
D. Glomerulus -
- 21.
Which of the paranasal sinuses is the last to develope
- A.
Frontal
- B.
Ethmoidal
- C.
Sphenoidal
- D.
Maxillary
Correct Answer
A. Frontal -
- 22.
What is an important function of the choroid plexus
- A.
To divide the cerebellum
- B.
To produce cerebrospinal fluid
- C.
To protect the brain
- D.
To provide comunication between the cerebella and cerebrum
Correct Answer
B. To produce cerebrospinal fluid -
- 23.
What is the only movable joint in the cranium
- A.
Maxilary
- B.
Zigomatic
- C.
Temporomandibular
- D.
Sphenomandibular
Correct Answer
C. Temporomandibular -
- 24.
Which gland can be palpated by placing the index and middle fingers just anterior and inferior to the earlobe
- A.
Parotid
- B.
Parathyroid
- C.
Submandibular
- D.
Sublingual
Correct Answer
A. Parotid -
- 25.
The digital to analog converter insures that the data is free from artifacts and contain enough usable data. this is known as
- A.
Formatting
- B.
Continuoussampling
- C.
Quality conversion
- D.
Preprocessing
Correct Answer
D. Preprocessing -
- 26.
Which artifact indicates a detector is defective
- A.
Aliasing
- B.
Noise
- C.
Ring
- D.
Partial volume averaging
Correct Answer
C. Ring -
- 27.
What does fourier transform calculate
- A.
Homogeneity of the xray beam
- B.
The lenghth of time for the xrays to pass through the patient and strike the detectors
- C.
The probability that the xray beam will be deflected
- D.
The distance between the patient and the detectors
Correct Answer
B. The lenghth of time for the xrays to pass through the patient and strike the detectors -
- 28.
What does the slice thickness affect
- A.
How the details of the exam will appear
- B.
Beam energy
- C.
The algorythem for backprojection
- D.
Matrix size
Correct Answer
A. How the details of the exam will appear -
- 29.
What determines the focal spot size
- A.
Scan field of veiw
- B.
Cathode filiment and anode target angle
- C.
Linear attenuation coeficient and pitch
- D.
Prepatient collimator
Correct Answer
B. Cathode filiment and anode target angle -
- 30.
What allows continuous xray production in todays ct scanners
- A.
Stationary rotors
- B.
Rorating anodes
- C.
Rotating detector array
- D.
Pencil beam geomitry
Correct Answer
B. Rorating anodes -
- 31.
The analog to digital converter contains several parts,which part of the adc asigns the binary numbers that become the digital signal
- A.
Sampler
- B.
Quantisizer
- C.
Dispencer
- D.
Coder
Correct Answer
D. Coder -
- 32.
The scan field of veiw is mostly responsible for
- A.
Pitch
- B.
Contrast resolution
- C.
Interpolation
- D.
Spatial resolution
Correct Answer
D. Spatial resolution -
- 33.
The pixel size in an image using a 512 x 512 matrix and a display field of veiw of 30.2 cm is__mm
- A.
0.79
- B.
0.99
- C.
0.39
- D.
0.59
Correct Answer
D. 0.59Explanation
convert30.2 to mm =302and divide by 512=0.59Rate this question:
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- 34.
What are the purpose of filters within the xray tube of a ct scanner
- A.
To decrease the scan time
- B.
To remove high energy photons from the beam
- C.
To remove low energy xray photons from the beam
- D.
To increase patient dose
Correct Answer
C. To remove low energy xray photons from the beam -
- 35.
In helical ct scanning , a pitch of 1 results in ________bands of data
- A.
Fewer
- B.
Overlapping
- C.
Adjacent
- D.
More
Correct Answer
C. Adjacent -
- 36.
Which of the following is a characteristic of 3rd generation ct scanners
- A.
The detectors are arranged in linear configuration
- B.
The xray tube and detectors rotate continuously in a 360 degree arc
- C.
The scanner uses a side to side motion called translation
- D.
The assembly is stopepd and rotated between each scan
Correct Answer
B. The xray tube and detectors rotate continuously in a 360 degree arc -
- 37.
The way the xray beam passes through the patient and is aquired by the ct detectors is calledbeam
- A.
Geometry
- B.
Speed
- C.
Transmission
- D.
Projection
Correct Answer
A. Geometry -
- 38.
Which ct scanners were designed for cardiac imaging specifically
- A.
Third
- B.
Fifth
- C.
Fourth
- D.
Second
Correct Answer
B. Fifth -
- 39.
What is another name for 6th generation ct scanners
- A.
Transaxial
- B.
Nutational
- C.
Translational
- D.
Helical
Correct Answer
D. Helical -
- 40.
Which are the typical matrix sizes for todays ct scanners1. 512 x 5122. 120 x 1203. 1024 sx 1024
- A.
1 and 2
- B.
2 and 3
- C.
1 and 3
- D.
1, 2 and 3
Correct Answer
C. 1 and 3 -
- 41.
What are the types of filtration used in ct1. beam shaped2. mathmatical3. projection
- A.
1 and 2
- B.
1,2, and 3
- C.
2 and 3
- D.
1. and 3
Correct Answer
A. 1 and 2 -
- 42.
In 2nd gen. scanners , what shape wasthe xray beam
- A.
Pencil
- B.
Cone
- C.
Fan
- D.
Rectangular
Correct Answer
C. Fan -
- 43.
Who created the first ct scanner
- A.
Robert ledley
- B.
Godfrey hounsfield
- C.
Johan radon
- D.
Allen cormack
Correct Answer
B. Godfrey hounsfield -
- 44.
The process by which each voxel is assigned a specific number to represent it's brightness is called
- A.
Translation
- B.
Specification
- C.
Computation
- D.
Quantization
Correct Answer
D. Quantization -
- 45.
How long should an xray tube last in a busy ct department
- A.
One year
- B.
6 months
- C.
2 years
- D.
18 months
Correct Answer
A. One year -
- 46.
In ct, the actual area of interest scanned is called the
- A.
Region of interest
- B.
Scan field of view
- C.
Display field of view
- D.
Matrix
Correct Answer
C. Display field of view -
- 47.
Which of these components is part of the data acquisition system used in digital imaging
- A.
Algorythm
- B.
Analog to digital converter
- C.
Picture archiving and communication system
- D.
Detector
Correct Answer
B. Analog to digital converter -
- 48.
Pixel size = field of veiw divided by _________
- A.
Matrix size
- B.
Scan thickness
- C.
Voxel size
- D.
Scan time
Correct Answer
A. Matrix size -
- 49.
The detectors ability to gather the xray photons that pass through the patient is call ___________ efficiency
- A.
Capture
- B.
Dynamic
- C.
Absorption
- D.
Reproducibility
Correct Answer
A. Capture -
- 50.
What component applies algorithyms to the attenuation data to produce the final ct image
- A.
Archiving system
- B.
Sample/ hold/unit
- C.
Analog to digital converter
- D.
Array processor
Correct Answer
D. Array processor -
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Current Version
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Jan 22, 2013Quiz Edited by
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Dec 21, 2010Quiz Created by
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