homework review 4

Question 1

The term _____ means away from the torso.

Answer 1

distal

Question 2

Which body plane separates the body into superior and inferior portions?

Answer 2

axial

Question 3

The large opening on the inferior aspect of the occipital bone through which the spinal cord descends from the skull is the

Answer 3

foramen magnum

Question 4

The _____ cistern is located between the temporal lobes and contains the circle of Willis.

Answer 4

interpenduncular (basal

Question 5

the largest cranial nerve is the

Answer 5

trigeminal nerve

Question 6

the internal and external jugular veins empty into the:

Answer 6

subclavian vein

Question 7

What images are particularly useful for assessing bone when the plane of the bone runs parallel to the axial slice?

Answer 7

coronal

Question 8

What is the most common condition evaluated by repeated computed tomographic head scanning?

Answer 8

chronic subdural hematoma

Question 9

did you review anatomy pictures?

Answer 9

yes

Question 10

Image acquisition is primarily obtained in the ___________ plane.

Answer 10

axial

Question 11

Because enhancement persists for hours, at least ___________ hours should elapse after a contrasted examination before an unenhanced scan is obtained.

Answer 11

6-8 hours

Question 12

true/false: As with plain radiographs, transverse images and coronal reformatted images are viewed as if facing the individual.

Answer 12

true

Question 13

in multiphase imaging studies, biliary calculi are BEST demonstrated in the:

Answer 13

native (unenhanced) phase

Question 14

in a multiphase liver study, enhancement of the hepatic artery and portal vein is BEST demonstrated in the:

Answer 14

late arterial phase

Question 15

in CT urography, the urinary tract and bladder are BEST demonstrated in the:

Answer 15

delayed phase

Question 16

Routine abdomen/pelvis CT exams require a scan delay of ______ after the injection of IV contrast.

Answer 16

65-75 seconds

Question 17

For a pulmonary embolism study, the bolus tracking reference location should be placed in the:

Answer 17

main pulmonary artery

Question 18

A high-spatial-frequency algorithm is generally applied to a chest exam to display:

Answer 18

air filled spaces

Question 19

Which of the following techniques can be used to reduce the effect of metal artifacts?

decreasing mA
decreasing pitch
decreasing WW and WL
decreasing gantry rotation time

Answer 19

decreasing gantry rotation time

Question 20

The scan range for a cervical spine exam should extend from the base of the skull through the level of:

Answer 20

T2

Question 21

Which of the following is an advantage of axial acquisition in routine head imaging?

greater detail
less motion
faster scan time
improved postprocessing

Answer 21

greater detail

Question 22

Which of the following is a common indication for a non-contrast CT of the head?

metastatic disease
stroke
arteriovenous malformation
aneurysm

Answer 22

stroke

Question 23

the preferred IV location for CTA of the carotid arteries is the

Answer 23

right arm

Question 24

A typical kVp setting for CT brain perfusion is

Answer 24

80 kVp

Question 25

Cryoablation freezes tissue with the use of:

Answer 25

argon gas

Question 26

Which of the following is TRUE of retrospective ECG gating? a. it results in a lower radiation dose than prospective gating b. it uses a sequential (axial) scan mode c. it acquires data during the entire heart cycle d. it depicts the heart as motionless

Answer 26

c. it acquires data during the entire heart cycle

Question 27

The purpose of administering beta blockers during cardiac exams is to

Answer 27

decrease cardiac motion

Question 28

T/F: 3D imaging of vascular structures with an intravenous (IV) injection of contrast media is called CT angiography

Answer 28

true

Question 29

All the following are automated systems used to assist with contrast administration except: a. Smart Bolus. b. CARE Bolus. c. Sure Start. d. Smart Prep.

Answer 29

Smart Bolus

Question 30

All the following are shading algorithms except: a. polygonal shading. b. flat shading. c. Gouraud shading. d. Phong shading.

Answer 30

a. polygonal shading.

Question 31

An internal representation of surfaces that will be visible in the displayed image and then “lights” according to a standard protocol describes

Answer 31

surface rendering

Question 32

Anatomy missed because of patient respiration can have what type of appearance on the final 3D image?

Answer 32

stairstep artifact

Question 33

CT screening has been used in all the following except: a. breast screening. b. lung cancer screening. c. colon screening. d. whole-body screening of healthy patients.

Answer 33

a. breast screening.

Question 34

Shaded surface display images are useful in the display of all the following except: a. demonstrating tortuous structures. b. surface controls of vessels. c. vascular relationships. d. vessel origins.

Answer 34

a. demonstrating tortuous structures.

Question 35

Operators standing in the CT room during the procedure must wear all the following except: a. sterile gowns. b. lead glasses. c. thyroid shields. d. lead aprons.

Answer 35

a. sterile gowns

Question 36

the maximum fluoroscopy time for continuous imaging is

Answer 36

100 seconds

Question 37

Virtual endoscopy allows the viewer to “fly through” each of these structures except: a. colon. b. cortical bone. c. vessels. d. tracheobronchial tree.

Answer 37

b. cortical bone