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CT Cross Training > ASRT 7 (NEED TO STUDY!!) > Flashcards

ASRT 7 (NEED TO STUDY!!) Flashcards

1
Q

Which of the following MDCT detector configuration uses detectors with the same length in the longitudinal direction?
A. Uniform matrix array.
B. Hybrid array.
C. Adaptive array.
D. Curvilinear stationary array.

A

A. Uniform matrix array.

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2
Q

Which of the following would reduce pt dose in CT imaging?
A. Decrease pitch.
B. Increase mA.
C. Iterative reconstruction.
D. Increase kVp.

A

C. Iterative reconstruction.

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3
Q

Which portion of the normal ECG waveform corresponds to the ventricular systole of the heart?
A. P wave.
B. P-Q wave.
C. QRS wave.
D. T wave.

A

C. QRS wave.

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4
Q

The average CT number assigned for blood is approximately:
A. -1000.
B. 0.
C. 20.
D. 3000.

A

C. 20.

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5
Q

Which of the following anatomical locations would be most suitable to use with automated bolus-tracking software to acquire images for the evaluation of a PE during a CTA chest?
A. Celiac trunk.
B. Main pulmonary artery.
C. Inferior vena cava.
D. Descending aorta.

A

B. Main pulmonary artery.

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6
Q

A typical flow rate for a CTA of the abdomen to evaluate for aortic dissection is:
A. 0.5 to 1 mL/s.
B. 1 to 2 mL/s.
C. 4 to 5 mL/s.
D. 7 to 8 mL/s.

A

C. 4 to 5 mL/s.

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7
Q

Normal adult partial thromboplastin time (PTT) lab values should be in the range of:
A. 2-10 seconds.
B. 12-15 seconds.
C. 25-35 seconds.
D. 60-70 seconds.

A

C. 25-35 seconds.

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8
Q

__________ is used to measure beam quality & determine the amount of filtration required.
A. Uniformity.
B. MTF.
C. The half-value layer (HVL).
D. Linearity.

A

C. The half-value layer (HVL).

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9
Q

Which of the following methods can be used to help identify the vaginal canal and evaluate a mass?
A. Position the patient in a right lateral decubitus.
B. Use rectal contrast.
C. Have the patient insert a tampon before the exam.
D. Administer a B-blocker prior to the scan.

A

Answer: C.

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10
Q

A CT scan using a _________ setting would deliver the highest radiation dose.
A. 150 mAs.
B. 200 mAs.
C. 250 mAs.
D. 300 mAs.

A

D. 300 mAs.

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11
Q

What pathological condition is characterized by free air or gas in the peritoneal cavity?
A. Pneumoperitoneum.
B. Volvulus.
C. Ileus.
D. Ascites.

A

A. Pneumoperitoneum.

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12
Q

Which of the following CT scans would result in the most uniform radiation dose distribution?
A. Pelvis.
B. Abdomen.
C. Brain.
D. Chest.

A

C. Brain.

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13
Q

Which of the following techniques reduces the risk of motion artifacts due to cardiac motion on a CT of the chest?
A. Decreasing pitch.
B. Placing the pt in the right decubitus position.
C. Instructing the pt to breathe during the scan.
D. Using the shortest possible scan time.

A

D. Using the shortest possible scan time.

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14
Q

To reduce the risk of a windmill artifact:
A. Adjust the WW and WL settings.
B. Use vendor-recommended pitch selections.
C. Use the shortest scan time possible.
D. Increase the mA setting.

A

B. Use vendor-recommended pitch selections.

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15
Q

What type of medication is used as a local anesthetic for a CT-guided biopsy of the liver?
A. B-Blocker.
B. Diphendydramine.
C. Warfarin.
D. Lidocaine (1%).

A

D. Lidocaine (1%).

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16
Q

The __________ of the liver is located on the inferior & posterior surface between the IVC and the ligamentum venosum.
A. Left lobe.
B. Quadrate lobe.
C. Caudate lobe.
D. Right lobe.

A

C. Caudate lobe.

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17
Q

Which of the following increases a pts radiation dose during a helical CT examination?
A. reduced multiphase scanning.
B. Iterative reconstruction techniques.
C. Decreased exposure techniques (mA/kVp).
D. Overranging.

A

D. Overranging.

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18
Q

What is the typical anatomical scan range for a cardiac CT with retrospective gating?

A

1 cm below the carina to just below the heart apex.

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19
Q

What type of reconstruction algorithm is best for displaying soft tissue anatomy?
A. Standard algorithm.
B. High spatial frequency algorithm.
C. Detail algorithm.
D. Bone algorithm.

A

A. Standard algorithm.

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20
Q

Which of the following medications is an antihistamine?
A. Diphenhydramine.
B. Nitroglycerine.
C. Atropine sulfate.
D. Warfarin.

A

A. Diphenhydramine.

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21
Q

Which of the following pathologies requires IV contrast for optimal evaluation during a CT head exam?
A. Early infarction.
B. ICH.
C. Metastasis.
D. Trauma.

A

C. Metastasis.

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22
Q

Which of the following moves during a CT localizer scan?
A. The detector system.
B. The patient table.
C. The gantry.
D. The x-ray tube.

A

B. The patient table.

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23
Q

Low-HU oral barium, such as VoLumen or E Z EM, contains:
A. 0.1% barium sulfate.
B. 1 to 3% barium sulfate.
C. 20% barium sulfate.
D. 40 to 50% barium sulfate.

A

A. 0.1 barium sulfate.

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24
Q

When evaluating the intradural space during a lumbar spine CT, the _____ route is used for contrast administration.

A

Intrathecal.

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25
Q

On a CT image, an ICH that is more than 6 months old would appear:
A. Hyperdense.
B. Radiolucent.
C. Isodense.
D. Hypodense.

A

D. Hypodense.

(A new ICH would appear hyperdense!).

26
Q

The measurements obtained from the detector array are the:

A

Raw data.

27
Q

The abnormal accumulation of fluid in the pleural cavity is:

A

Pleural effusion.

28
Q

The abnormal level of consciousness which describes a patient in a state of near unresponsiveness is called:
A. a coma.
B. lethargy.
C. Confusion.
D. Stupor.

A

D. Stupor.

29
Q

Which of the following is the automated software feature that notifies the technologist that an obtained CTDIvol or DLP greater than the suggested limit for an individual CT acquisition?
A. Automatic brightness control.
B. Dose alert.
C. Automatic tube current modulation.
D. Dose notification.

A

D. Dose notification.

30
Q

What dose measurement calculates two-thirds of the radiation dose at the periphery and one-third in the center along the x- and y- axes?
A. DLP.
B. CTDIw.
C. CTDIvol.
D. CTDI100.

A

B. CTDIw.

31
Q

An adrenal mass on a noncontrast CT scan has an ROI greater than 10 HU. After injection of IV contrast, how long should the scan delay be set for a post-contrast series?
A. 15 to 20 seconds.
B. 25 to 35 seconds.
C. 60 to 70 seconds.
D. 180 seconds.

A

C. 60 to 70 seconds.

32
Q

The most common method of positioning the arm for a CT exam of the wrist?

A

Extend the pts arm over their head in either a supine or prone position.

33
Q

A(n) _____ mass is benign if the HU is less than 10 or an unenhanced abdominal CT.

A

Adrenal.

34
Q

Which of the following anatomical structures would be best-visualized with a post-processed MinIP image?
A. Trachea.
B. Scapula.
C. Aorta.
D. Circle of Willis.

A

A. Trachea.

35
Q

Which of the following window settings would be the most suitable for evaluation of the mediastinum?
A. WW 1400, WL -450.
B. WW 2000, WL -350.
C. WW 350, WL 40.
D. WW 780, WL 180.

A

C. WW 350, WL 40.

36
Q

__________ acquires data for at least a half-rotation of the gantry at the beginning and end of a helical scan for image reconstruction.

A

Overranging.

37
Q

What CT procedure involves inflating the colon with room air or CO2 for the purpose of distending the bowel walls?

A

Colongraphy.

38
Q

Which of the following is a commonly used kVp setting for a CT of the soft tissue neck?
A. 80 kVp.
B. 100 kVp.
C. 120 kVp.
D. 140 kVp.

A

C. 120 kVp.

39
Q

Which of the following radiation measurements reports an average central radiation dose along with any scatter overlap from a series of scans?
A. CTDI.
B. MSAD.
C. DLP.
D. Gy.

A

B. MSAD.

40
Q

Which of the following is a pathological condition in which a loop of the intestine twists and creates an obstruction?
A. Volvulus.
B. Fibrous adhesion.
C. Intussusception.
D. Paralytic ileus.

A

A. Volvulus.

41
Q

Contrast dose calculations for pediatric patients are typically based on:
A. Age.
B. Weight.
C. Height.
D. Pulse rate.

A

B. Weight.

42
Q

The type of central venous catheter with the LOWEST RISK of infection is the:
A. Groshong catheter.
B. Broviac catheter.
C. Implanted port.
D. Hickman catheter.

A

C. Implanted port.

43
Q

Which of the following pathological conditions may be best visualized in expiratory images of a HRCT of the chest?
A. Pneumothorax.
B. Pulmonary nodule.
C. Air trapping with small airway disease.
D. PE.

A

C. Air trapping with small airway disease.

44
Q

What is the pixel size for CT images reconstructed with a DFOV of 38 cm and a matrix of 1024x1024?

A

0.37 mm.

d = FOV/matrix size.
38 = x / 1024x1024
38/1024 = x (0.37).

45
Q

Interpolation is used during the reconstruction of helical CT images to:
A. Decrease DFOV.
B. Increase matrix size.
C. Alter the WW and WL settings.
D. Remove image blur.

A

D. Remove image blur.

46
Q

Which of the following CT series would best demonstrate spondylolisthesis in the lumbar spine?
A. Axial oblique.
B. Coronal.
C. Sagittal.
D. Axial.

A

C. Sagittal.

47
Q

To reduce a partial volume artifact on a CT image:

A

Use thinner slices.

48
Q

Which of the following should be used for intrathecal injection of contrast media?
A. Central venous line.
B. Spinal needle.
C. Butterfly needle.
D. Angiocatheter.

A

B. Spinal needle.

Key word: INTRATHECAL INJECTION!!

49
Q

What technical factor controls the number of electrons that are emitted from the cathode by thermionic emission?
A. kVp.
B. mA.
C. Pitch.
D. Rotational speed.

A

B. mA.

50
Q

A CT coronary calcium screening score of more than 400 indicates:

A

Extensive plaque.

51
Q

With all other factors remaining consistent, which of the following changes would reduce a patient’s radiation dose during a helical CT exam?
A. Decrease kVp.
B. Alter the WW and WL.
C. Increase mAs.
D. Decrease pitch.

A

A. Decrease kVp.

52
Q

If the WL of a CT image is set to 400 and the WW is 200, the pixels displayed will be in the range of:

A

300 to 500.

  1. divide the WW in half (200/2 = 100).
    This number will be subtracted & added to the WL value to calculate the range: 300 to 500.
53
Q

Why is the CT x-ray tube kept vacuum-sealed?

A

To prevent air molecules from intercepting electrons.

54
Q

All of the following are advantages of performing CT of the musculoskeletal system instead of radiography, EXCEPT:
A. multiplanar and 3-dimensional reformats.
B. displaying both sides of an extremity.
C. reduced radiation dose.
D. displaying bone and soft tissue.

A

Answer: C.

55
Q

Which of the following techniques is commonly included in a CT urogram procedure?
A. obtaining inspiration and expiration scans.
B. using rectal contrast.
C. placing the patient in a prone position.
D. having the patient drink a 16 oz glass of water an hour before the exam.

A

Answer: D.

56
Q

__________ is the process of adjusting the parameters of a CT acquisition to produce acceptable quality images and reduce patient dose.

A

Protocol optimization.

57
Q

A typical lung window setting would be:

A

WW 1500, WL -600.

58
Q

The most common indication for a CT-guided radiofrequency ablation (RFA) is:
A. Adenoma.
B. Hepatic neoplasm.
C. Appendicitis.
D. Liver abscess.

A

B. Hepatic Neoplasm.

59
Q

What type of reconstruction algorithm is preferred during a CT chest without contrast for the evaluation of small pulmonary nodules?
A. Standard.
B. Smoothing.
C. High spatial frequency.
D. Edge enhancement.

A

A. Standard.

60
Q

What is the SI unit of effective dose?

A

Sievert.

61
Q

Absorbed dose is measured in:

A

Grays (Gy).

62
Q

The ability of a CT system to rapidly acquire data without blurring or motion is defined as its:

A

Temporal resolution.

CT Cross Training (28 decks)

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