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SUMMER 2024: Radiographic Equipment > Week 2 Homework > Flashcards

Week 2 Homework Flashcards

1
Q

A lead apron of at least ____ mm Pb/eq must be worn by all people (except the patient) present in the fluoroscopic room during an exposure.

A. 0.35
B. 0.50
C. 0.25
D. 0.40

A

B. 0.50

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2
Q

The bucky slot cover must have ___ mm Pb/eq to protect the gonads of the fluoroscopist.

A. 0.20
B. 0.25
C. 0.10
D. 0.15

A

B. 0.25

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3
Q

Digital fluoroscopy created by a flat panel image receptor (FPIR), also called a flat panel detector:

A. Operates in fluoroscopic mode, with less than 5 mA.

B. Increases the radiation dose to the patient during magnification mode.

C. Uses pulse progressive fluoroscopic technology.

D. Has a higher patient dose when compared to image intensified fluoroscopy.

A

C. Uses pulse progressive fluoroscopic technology.

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4
Q

Digital fluoroscopy with a CCD has lower ____________ and higher ____________when compared to image intensified fluoroscopy with a television camera positioned at the output phosphor.

A. Spatial resolution, maintenance
B. Contrast resolution, patient dose
C. Patient dose, DQE
D. Light sensitivity, patient dose

A

C. Patient dose, DQE

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5
Q

Reducing noise and image file size by combining up to four pixels during fluoroscopic image processing is accomplished through:

A. pixel binning
B. vignetting
C. flux gain
D. pause and pulse

A

A. pixel binning

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6
Q

During Fluoroscopy, the SOD on a fixed unit cannot be less than ______________ inches.

A. 15 in (38 cm)
B. 12 in (30 cm)
C. 40 in (100 cm)
D. 20 in (50 cm)

A

A. 15 in (38 cm)

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7
Q

During digital fluoroscopy, the tube is protected from heat overload due to:

A. Low mA
B. Pulse-progressive fluoroscopy
C. Continuous fluoroscopy
D. High DQE

A

B. Pulse-progressive fluoroscopy

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8
Q

Federal law requires that under normal operation, the Entrance Skin Dose (dose at table-top) rate shall not exceed ______________ for conventional fluoroscopic procedures.

A. 5 R/min
B. 3 R/min
C. 10 R/min
D. 20 R/min

A

C. 10 R/min

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9
Q

With fluoroscopy, strips of lead rubber forming a drape of ____ Pb/eq are positioned between the fluoroscopist and the patient.

A. 0.10
B. 0.25
C. 0.35
D. 0.5

A

B. 0.25

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10
Q

The flat panel detector used in fluoroscopy enables the operator to use magnification mode with _______ in patient dose, whereas the image intensifier used in fluoroscopy enables the operator to use magnification mode with ________ in patient dose.

A. no increase; an increase
B. an increase; no increase

A

A. no increase; an increase

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11
Q

In pulse-progressive fluoroscopy, the fraction of time that the x-ray tube is energized is called the:

A. Extinction time
B. Interrogation time
C. Subtraction time
D. Duty cycle

A

D. Duty cycle

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12
Q

A charged coupled device used in digital fluoroscopy:

A. Provides low spatial resolution

B. Has a low detective quantum efficiency (DQE)

C. Replaces the image intensifier in conventional units

D. Replaces the television camera tube in image

A

D. Replaces the television camera tube in image

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13
Q

The flat panel image receptor (FPIR) is an array of detector elements (DELS) and is composed of pixels made from cesium iodide (CsI) and:

A. Amorphous silicon
B. Antimony compounds
C. Zinc Cadmium Sulfide
D. Crystallized Silicon

A

A. Amorphous silicon

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14
Q

At all radiation levels in fluoroscopy, which device maintains a high DQE (detective quantum effeciency)?

A. Image intensifier with charge-coupled device (CCD)
B. Cathode ray tube (CRT)
C. Flat panel image receptor (FPIR)
D. Image intensifier with television camera

A

C. Flat panel image receptor (FPIR)

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15
Q

The advantage of flat-panel image receptors over image intensifiers in digital fluoroscopy include:

A. High DQE
B. Low SNR
C. Affected by external magnetic fields
D. Circular imaging area

A

A. High DQE

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16
Q

Advantages of using a charge coupled device (CCD) in digital fluoroscopy systems include:

  1. High spatial resolution
  2. Increased lag
  3. Lower patient dose
A

1, 3
(High spatial resolution & lower patient dose)

17
Q

Most digital fluoroscopic systems are capable of 8-bit processing, or ____ shades of gray.

A. 64
B. 256
C. 32
D. 16

A

B. 256

18
Q

Most digital fluoroscopic units have this feature which simply maintains the last real-time fluoroscopic image on the viewing monitor until it is replaced by the unit being activated again.

A. automatic brightness control (ABC)
B. last image hold
C. minification gain
D. magnification mode

A

B. last image hold

19
Q

Viewing the fluoroscopic digital image during an exam routinely occurs on a ____________, which is rapidly replacing the cathode ray tube (CRT):

A. CCD
B. Vidicon
C. Flat panel image display
D. Plumbicon

A

C. Flat panel image display

20
Q

With fluoroscopy, federal law requires an audible _____ minute timer that can be reset as many times as necessary to complete a procedure.

A. 15
B. 20
C. 5
D. 10

A

C. 5

21
Q

In digital fluoroscopy, the time it takes for the generator to switch off is referred to as:

A. Rest period
B. Duty cycle
C. Extinction time
D. Interrogation time

A

C. Extinction time

22
Q

With the flat panel image receptor (FPIR), the image captured is:

A. Circular
B. Ellipsoidal
C. Square or rectangular
D. Triangular

A

C. Square or rectangular

23
Q

Digital fluoroscopy with a charge-coupled device has lower ______________ and higher ___________than image intensfied fluoroscopy with the television camera at the output phosphor.

A. Light sensitivity, patient dose
B. Signal-to-noise ratio, patient dose
C. Detective quantum efficiency, maintenance
D. Patient dose, light

A

D. Patient dose, light

24
Q

During digital fluoroscopy, the time required for the x-ray tube to turn on and reach the mA and kVp selected is called the:

A. Duty time
B. Stabilization time
C. Interrogation time
D. Extinction time

A

C. Interrogation time

25
Q

In digital fluoroscopy, the x-ray tube operates in radiographic mode using __________ mA.

A. Hundreds of
B. Less than a hundred
C. 0.5-5.0
D. Single phase

A

A. Hundreds of

SUMMER 2024: Radiographic Equipment (11 decks)

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