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CT Exam Prep > CT Tutor Test 1 Wrong Answers > Flashcards

CT Tutor Test 1 Wrong Answers Flashcards

1
Q

Cone beam artifacts are related to the advances found in multi-row scanners because:

A

The traditional filtered back projection method of reconstruction cannot handle image formation with a beam collimation greater than 20mm

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2
Q

The system that consists of a secure network for transmission of patient information, a CT scanner, multiple workstations for interpreting and reviewing images and storage archived is called:

A

PACs

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3
Q

SFOV (or scan field of view) controls the diameter of the data acquired and is determined by

A

The detector array

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4
Q

The positioning system that assumes the patient is in the supine position is called:

A

Patient coordinate system

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5
Q

The technology that allowed the smaller, high-frequency generator to be located inside the CT gantry:

A

Slip ring technology

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6
Q

The main purpose of filtered backprojection is

A

To create artifact free images

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7
Q

What is the normal range for adult blood urea nitrogen (BUN) levels?

A

5-20 mg/dL

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8
Q

As the section (slice) width is increased the collimation is decreased.

True

False

A

True

Collimation determines slice width, the greater the collimation the smaller the slice width.

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9
Q
A

Lymphoma

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10
Q

Which of the following symptoms would be exhibited in a patient experiencing shock?

Rapid, shallow breath

Cyanosis

Tachycardia

All of the above

A

All of the above

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11
Q

Of the following x-ray interactions between the x-ray beam and the patient which results in the most patient dose?

Photoelectric effect

Bremsstrahlung

Compton scatter

Characteristic

A

Photoelectric effect

The photoelectric interaction results in the complete absorption of the energy from the incident x-ray photon within the patient’s body.

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12
Q

The type of image reconstruction used in the first-generation prototype CT scanner was _____________.

Convolution method

Fourier transform

Back-projection

Iterative technique

A

Iterative technique

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13
Q

With cupping artifacts, CT numbers are higher at the edges of the image and lower in the center.

True

False

A

true

There is less beam hardening at the edges of the image hence higher CT numbers and the radiation path are longer to the center of the image which causes a low number in the center.

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14
Q

Parotid gland

Submandibular gland

Sublingual gland

Salivary gland

A

Submandibular gland

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15
Q

If the filter at the aperture of the x-ray tube removed even more low energy x-ray photons which of the following would result?

An increase in partial volume artifacts.

A decrease in partial volume artifacts.

An increase in beam hardening artifacts.

A decrease in beam hardening artifacts.

A

A decrease in beam hardening artifacts.

Removing more of the low energy x-ray photons results in higher energy in the incident x-ray beam. This will decrease the amount of beam hardening artifacts due to the removal of the low energy x-ray photons.

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16
Q

When administering intravenous iodinated contrast media what type of infection control technique is required?

Surgical asepsis

Enteric precautions

Medical asepsis

Droplet isolation

A

Surgical asepsis

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17
Q

The average density of a solitary pulmonary nodule indicates it is benign when it falls within the following ranges…

15-30 Hounsfield units

50-80 Hounsfield units

125-145 Hounsfield units

175-200 Hounsfield units

A

175-200 Hounsfield units

Researchers feel pulmonary nodules appearing on CT examinations of the lungs can be considered benign if their average density is more than +164 Hounsfield units. The closer to +200 Hounsfield units the more certain the benign diagnosis is accurate.

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18
Q

Internal jugular vein

Internal carotid artery

External carotid artery

Common carotid artery

A

Common carotid artery

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19
Q

When completing a CT examination for the post-myelogram of the lumbar spine in an adult patient, which of the following would be an acceptable range for contrast volume for the intrathecal injection?

1-3 mL

5-9 mL

12-14 mL

18-22 mL

A

12-14 mL

The injection rate should not exceed approximately 17 mL in an adult patient, keeping the total dose of iodine below 3 grams. The most common range of injection during post-myelographic CT is 12-14 mL in an adult patient.

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20
Q

The acetabulum is formed by which of the following pelvic bones?

  1. Pubis
  2. Ischium
  3. Ilium
A

1, 2, and 3

21
Q

The direction of the streaks that result from the edge gradient effect is perpendicular to the direction of the sharp density difference interface.

True

False

A

False

The edge gradient effect results from structures that have sharp edges and great density differences from neighboring tissues such as the interface of air and contrast media or bone and soft tissue. The resulting streak artifacts appear parallel to the direction of the sharp density difference interface due to the incorrect attenuation information that is collected and misinterpreted during the reconstruction process.

22
Q

Aneurysm

Embolus

Thrombus

Abdominal neurogenic tumor

A

Thrombus

23
Q

Transverse sinus

Sigmoid sinus

Straight sinus

Inferior sagittal sinus

A

Straight sinus

24
Q

The normal range of respiratory rate in a child is…

A

20 to 30 breaths per minute

25
Q

Of the following types of contrast material which may be used during a CT examination of the chest?

Iopamidol

barium sulfate

Diatrizoate meglumine

All of the above

A

All of the above

Lopamidol is a non-ionic contrast media. Diatrizoate meglumine is an ionic contrast media. Barium sulfate contrast in the form of a paste is used to outline the esophagus.

26
Q

In reviewing a CT examination of a chest, the technologist notices a board or flat tabletop beneath the patient. This indicates what type of CT study?

Invasive

General survey

Radiation planning

Quantitative

A

Radiation planning

CT scans are used to localize an area of malignant pathology for radiation therapy treatment. During this type of CT scan, the patient must be positioned exactly the same as the position used during the radiation treatment.

27
Q

The units of Sv and rem are used to measure

A

any kind of ionizing radiation

28
Q

used to measure specifically x-ray radiation

A

rad and Gy

29
Q

Of the following areas of the head, which commonly become calcified due to pathology and the aging process?

  1. Pineal gland
  2. Choroid plexus
  3. Thalamus
A

1 and 2 only

30
Q

What is the primary reason iodine is the most common material used in radiopaque contrast media?

Viscosity

Radiolucency

Osmolality

High atomic number

A

High atomic number

31
Q

A patient has a prior history of lymphoma. Of the following sets of slice widths and spacing, which would be best for a CT scan of the abdomen and pelvis?

3 x 3 mm

5 x 15 mm

10 x 15 mm

10 x 30 mm

A

10 x 15 mm

CT scans of the abdomen and pelvis may be performed with spacings of 15-20mm when using an aperture size of 10mm. If warranted, contiguous scans may be performed on specific areas of interest.

32
Q

Ascending aorta

Left subclavian artery

Aortic arch

Aorta

A

Aortic arch

33
Q

normal BUN

A

8-23 mg/dL.

34
Q

Which of the following can be accurately demonstrated during a CT study of the abdomen without the use of iodinated contrast media?

  1. Appendicitis
  2. Renal stone
  3. Diverticulitis
  4. renal cyst
A

1, 2 and 3 only

35
Q

Outpocketings of the wall of the colon are commonly associated with ____________.

Polyps

Intussusception

Diverticulitis

Diverticulosis

A

Diverticulosis

Diverticulosis causes the presence of small pouch-like openings in the colon wall. Diverticulitis is the inflammation of the diverticula.

36
Q

A type of renal mass often seen in pediatric patients developing from immature kidney cells is termed…

von Hippel-Lindau disease

Wilm’s tumor

Krudenberg’s tumor

Ewing’s sarcoma

A

Wilm’s tumor

37
Q

Once the x-ray beam passes through an object the intensity of the beam to a detector is called the…

Ray

Transmitted intensity

Incident intensity

Primary beam

A

Transmitted intensity

38
Q

the amount of energy that passes through the patient onto a detector.

A

transmitted intensity

39
Q

The term ____________ describes a contrast material that does not dissociate into charged particles within a solution.

Neutral

Non-ionic

Osmolar

Ionic

A

Non-ionic

40
Q

What is the name of fibrous connective tissue that binds the kidneys in the retroperitoneum?

Fascia of Camper

Gerota’s fascia

Cooper’s ligament

Linea alba

A

Gerota’s fascia

41
Q

Water-soluble based oral contrast (gastroview) should not be used when?

A

The patient has ascites

42
Q

Hyoid bone

Thyroid gland

Epiglottis

Laryngeal vestibule

A

Epiglottis

43
Q

What is adult normal respiration?

A

12-25 breaths per minute

44
Q

The flow rate for a biphasic technique for a spiral CT study of the liver would include the which of the following sets?

2 mL/sec for 50 mL during the superior half of the liver

3 mL/sec for 50 mL followed by 1.5 mL/sec for 100 mL

2 mL/sec for 100 mL with scanning during both peak enhancement and the equilibrium phase

3 mL/sec for 150 mL with a 90 second delay before scanning

A

3 mL/sec for 50 mL followed by 1.5 mL/sec for 100 mL

A biphasic contrast injection of the liver should include a complete scan of the liver before the onset of equilibrium to avoid hepatic lesions from being obscured. A biphasic injection has a rapid initial flow rate followed by a slower injection rate.

45
Q

Slice thickness is governed by the

A

smallest single detector element.

46
Q

Stomach

Spleen

Liver

Pancreas

A

Stomach

47
Q

What is an average scan delay on a portal-venous phase abdomen?

20-40 seconds

40-70 seconds

2-5 minutes

6-8 minutes

A

40-70 seconds

48
Q

What is an average scan delay on a arterial phase abdomen?

20-40 seconds

40-70 seconds

2-5 minutes

6-8 minutes

A

20-40 seconds

49
Q

What is an average scan delay on a equalibrium phase abdomen?

20-40 seconds

40-70 seconds

2-5 minutes

6-8 minutes

A

CT Exam Prep (12 decks)

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