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CT Cross Training > MICC PRACTICE TEST CH.1 > Flashcards

MICC PRACTICE TEST CH.1 Flashcards

1
Q

In order for an X-ray photon to be measured it must:
1. Enter the detector chamber.
2. Be absorbed by the detector material.
3. Be converted to a measurable event.

(Pick the correct numbers)

A

1, 2, and 3.

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2
Q

Which system component converts the projection attenuation data into the proper digital form for the array processor?
A. Detector.
B. Photodiode.
C. Analog-to-digital converter.
D. Host computer.

A

C - analog-to-digital converter.

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3
Q

Which of the following is NOT a function of a PACS system?
A. Reconstruction of the image from the raw data.
B. Long term data storage.
C. Digital distribution of images.
D. Image display for the radiologists.

A

A - reconstruction of the image from the raw data.

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4
Q

Which of the following is NOT part of the CT tube?
A. Tungsten target.
B. Collimator.
C. Rotating anode.
D. Filament.

A

B - Collimator.

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5
Q

Which of the following is FALSE regarding CT systems? (Choose correct #(s)).
1. They are limited to non-oblique transverse scanning.
2. They can not generate a straight coronal or sagittal image.
3. They have no moving parts.

A

1, 2, and 3.

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6
Q

X-rays are used in CT because:
A. They are easily produced by the high frequency generator.
B. They are less harmful than the heating effects of microwave radiation.
C. They penetrate the body according to specific attenuation characteristics of each tissue.
D. The FDA imposes no limit on the dose to the pt.

A

C - They penetrate the body according to specific attenuation characteristics of each tissue.

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7
Q

Most of the commands from the technologist are received by the:
A. Array processor.
B. Operator’s console.
C. Host computer.
D. Amplifier.

A

B - Operator’s console.

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8
Q

X-rays are produced whenever fast-moving electrons collide with any form of matter because:
1. The electron splits into two X-ray photons of equal energy upon impact with the matter.
2. The electron loses kinetic energy which is converted into the emission of an X-ray photon.
3. The electron converts the electron it collides into an X-ray photon.

A. 1 only.
B. 2 only.
C. 3 only.
D. 1, 2, and 3.

A

B - 2 only.

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9
Q

The mA determines the:
A. Quantity of X-ray photons.
B. Coefficient of attenuation.
C. Slice thickness.
D. Energy level of the X-ray photons.

A

A - Quantity of X-ray photons.

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10
Q

Which of the following is a component NOT normally located in the gantry of a modern CT system?
A. Pre-patient collimation.
B. Solid-state detectors.
C. Array processor.
D. X-ray tube.

A

C - Array Processor.

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11
Q

Tube interscan delay time refers to:
A. The time between the end of one scan and the start of the next scan during which the tube will cool.
B. A quality assurance test performed daily by the technologist.
C. The time required for the tube to make a complete 360-degree revolution about the gantry.
D. The length of time required for the production of photons to begin after applying the voltage to the tube.

A

A - the time between the end of one scan and the start of the next scan during which the tube will cool.

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12
Q

Increased ________ will increase the likelihood that a given X-ray will penetrate a material.
1. KV. 2. MA. 3. Exposure time.

A. 1 only.
B. 2 only.
C. 3 only.
D. 1, 2, and 3.

A

A - 1 only.

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13
Q

Which of the following are NOT commonly used on today’s commercially available CT scanners?
1. Xenon detectors.
2. fourth-generation technology.
3. Continuous rotation technology.

A. 1 only.
B. 1 & 2.
C. 2 & 3.
D. 1, 2, & 3.

A

B - 1 & 2.

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14
Q

Which of the following statements is FALSE regarding occurrences after an X-ray photon penetrates the detector aperture?
1. The photon can pass through the detector unmeasured.
2. The photon is converted completely into an electron.
3. The measured signal is enhanced by an amplifier.

A. 1 only.
B. 2 only.
C. 3 only.
D. 1, 2, and 3.

A

B - 2 only.

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15
Q

Scatter radiation is caused by:
A. Miscalibrated detector.
B. X-rays generated spontaneously in the ambient atmosphere.
C. Deflections from the original trajectory of an X-ray photon through the pt.
D. Improper patient positioning.

A

C - Deflections from the original trajectory of an X-ray photon through the pt.

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16
Q

What control does the operator have over the X-rays in a CT exam?
A. The temperature and color of the X-rays can be tuned.
B. The energy level and quantity of X-rays can be selected.
C. The volume and tone of the X-rays can be dialed.
D. The phase and frequency of the X-rays can be adjusted.

A

B - the energy level and quantity of X-rays can be selected.

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17
Q

Which of the following is the standard that’s used to achieve compatibility for image transfer between various imaging modalities, viewing stations, and printers in the hospital?
A. TCP/IP.
B. T1.
C. PACS.
D. DICOM.

A

D - DICOM.

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18
Q

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 node in the tube.
C. X-ray filter in the tube which absorbs the lower energy photons before they can enter the patient.
D. Collision of the electron beam with the tungsten target on the tube anode.

A

D - Collision of the electron beam with the tungsten target on the tube anode.

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19
Q

__________ made helical imaging possible.
A. Multi-row detector scanners.
B. The introduction of 2nd generation technology.
C. The introduction of 4th generation technology.
D. Continuous rotation scanners.

A

D - Continuous rotation scanners.

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20
Q

The patient table:
A. May move continuously during the scan.
B. Can never be positioned automatically by software due to safety precautions.
C. Remain stationary throughout the patient exam once it is initially positioned.
D. Only moves after each slice is completed.

A

A - may move continuously during the scan.

21
Q

The main purpose of the detector is to:
A. Provide additional collimation in order to reduce scatter.
B. Limit the X-ray dose to the patient.
C. Capture X-ray photons and convert them to a measurable signal.
D. Amplify the measured signal.

A

C - capture X-ray photons and convert them to a measurable signal.

22
Q

The cathode filament:
A. Helps determine the size of the focal spot.
B. Lights up the tube so it can be serviced by an engineer.
C. Releases the X-ray photons.
D. Focuses X-rays onto the anode target.

A

A - Helps determine the size of the focal spot.

23
Q

Which of the following statements is true? (Pick one or more answers!)

  1. KV is the voltage potential b/t the cathode & anode while mA ultimately controls the filament current and thus, the temperature of the cathode filament.
  2. KV controls the energy level of the X-ray photons and mA controls the number of X-ray photons emitted from the tube.
  3. Although the kV and the mA affect the operation of the CT X-ray tube, the two parameters have no bearing on the image quality.
A

1 and 2 only.

24
Q

The number of electrons that flow from the cathode to the anode in the tube is controlled by the:
A. Anode target.
B. Collimation.
C. MA.
D. KV.

A

C - mA.

25
Q

Which of the following is TRUE regarding solid state detectors?
1. X-ray photons cause the detectors to generate a flash of light.
2. They are the detector type used on most CT scanners today.
3. They can be used in both third-generation & 4th generation CT systems.

A. 1 only.
B. 2 only.
C. 3 only.
D. 1, 2, and 3.

A

D - 1 2 and 3.

26
Q

The slip ring on continuous rotation CT scanners:
A. Prevents the high voltage cable from winding up.
B. Allows the exam to commence more rapidly.
C. Eliminates the need for the reversal of gantry frame rotation.
D. All of the above.

A

D - All of the above.

27
Q

CT is commonly referred to as all of the following names EXCEPT:
A. Computerized axial tomography.
B. Digital subtraction angiography.
C. CAT-scan.
D. Computed tomography.

A

B - Digital subtraction angiography.

28
Q

Which of the following CT scanner deigns does NOT use an X-ray tube?
A. First-generation CT.
B. PET/CT.
C. Electron beam CT.
D. MDCT.

A

C - Electron beam CT.

29
Q

__________ allow(s) remote authorized individuals to connect to a server in a secure fashion using the routing infrastructure provided on a public network, such as the internet.
A. DICOM.
B. T1 lines.
C. VPNs.
D. Increased bandwidth.

A

C - VPNS (Virtual Private Networks).

30
Q

Which technology do multiple row detector scanners employ?
A. 2nd generation.
B. 3rd generation.
C. 4th generation.
D. 1st generation.

A

B - 3rd generation.

31
Q

Which of the following statement is FALSE regarding the collection of CT data?
A. Long scan times are more discernible b/c they average out motion artifacts.
B. The reconstruction process used to create the image occurs in the array processor.
C. To collect the complete set of CT data, X-rays must be passed through the body at many different angles.
D. The detectors measure X-rays which completely penetrate the pt.

A

A

32
Q

On a single-row detector scanner, collimation:
A. Controls slice thickness.
B. Minimizes the X-ray dose to the pt.
C. Reduces the detection of scatter radiation.
D. All of the above.

A

D - All of the above.

33
Q

First Generation Scanners

A
  • Pencil beam.
  • Single detector.
  • The tube/detector assembly moved across the pt, then rotated by 1-degree.
  • Total scan time about 5 minutes per image.
34
Q

Second-Generation Scanners

A
  • Fan beam.
  • Multiple detectors in a straight line.
  • The tube/detector assembly moved across the pt, then rotated by 5-degrees.
  • Total scan time about 20 seconds per image.
35
Q

Third-generation scanners

A
  • Fan beam.
  • Multiple detectors along an arc.
  • The tube/detector assembly rotates around the pt.
  • Total scan time faster than 1 second per image.
  • Most scanners available today are based on 3rd generation technology.
36
Q

Fourth-Generation Scanners

A
  • Fan beam.
  • Multiple detectors encircle pt, but do NOT rotate.
  • Only the tube rotates around the pt.
  • Total scan time faster than 1 second per image.
37
Q

What is Interscan delay time?

A

It is the minimum amount of time that must transpire between the end of one scan and the initiation of the next scan.
- Interscan delay time includes idle time between scans to allow tube cooling.

38
Q

In a radiology department, a __________ is an example of a “client” on the network.
1. CT scanner.
2. Viewing console in the physician’s reading rom.
3. Printer for diagnostic images.

A. 1 only. C. 2 & 3.
B. 2 only. D. 1, 2, & 3.

A

D - 1, 2, & 3.

A “client” is any device that might need to access the images.

39
Q

Which of the following is TRUE regarding multi-row detector CT scanners?
A. The size of the detector arrays along the z-direction may be different.
B. The attenuation information from adjacent detector arrays may be added together to generate thicker slices.
C. All of the detector arrays may or may not be used.
D. All of the above are true statements.

A

D - All of the above are true statements.

40
Q

The CT X-ray tube rotates around the patient to:
A. Keep the tube cool.
B. Generate projection views at different angles.
C. Minimize the X-ray dose administered to the pt.
D. All of the above.

A

B - Generate projection views at different angles.

41
Q

Collimation:
A. Is accomplished by electrically blocking X-rays.
B. Affects the scan time.
C. Limits the low energy X-ray photons and passes the high energy photons.
D. Is accomplished by physically blocking X-rays.

A

D - is accomplished by physically blocking X-rays.

42
Q

Detector Capture Efficiency

A

Percentage of total available X-rays that actually enter the detector chamber.

43
Q

Detector Absorption Efficiency

A

Percentage of X-rays entering the chamber which collide with the detector atoms.

44
Q

Detector Conversion Efficiency

A

Percentage of X-rays colliding with the detector atoms which result in a measurable electrical signal.

45
Q

Tungsten is used as the target material on the tube’s anode because it has a ________ atomic number and a _________ melting point.

A

high; high.

46
Q

CT images can be directly scanned in planes other than transverse by:
1. Orienting the pts body part so that it is not perpendicular to the X-ray beam.
2. Tilting the gantry.
3. Changing the angle that the X-ray beam leaves the tube.

A. 1 only.
B. 1 & 2.
C. 2 & 3.
D. 1, 2, & 3.

A

B. 1 & 2.

47
Q

Which of the following does NOT affect the quantity of X-rays that completely penetrates the pt?
A. The distance that the X-ray photons must travel on their course through the pts body.
B. The molecular composition of the tissues through which the X-ray photons pass.
C. The type of detector material used.
D. All of the above.

A

C. The type of detector material used.

48
Q

The operator’s console may include:
A. Monitor.
B. Keyboard.
C. Graphic input device.
D. All of the above.

A

D - All of the above.

CT Cross Training (27 decks)

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