Quiz 3

Easy

100

The minus sign on this image represents: 

1. Anode

2. Source of x-ray photons

3. Anion

4. Cathode

4. Cathode

200

The plus sign on this image represents:

1. Cathode

2. Anode

3. Electron source

4. Cation

2. anode

300

The invisible, unprocessed data on an image detector immediately after X-ray exposure forms an electronic data set that forms the _____ image.

1. latent

2. remnant

3. manifest

4. post-processed

1. Latent 

400

The type of distortion that is shown:

1. Elongation

2. No shape distortion is shown in the image. 

3. Foreshortening

4. Penumbra 

1. Elongation

500

All the x-ray photons created within the tube have the same energy. 

1. This is true. The beam is mono-energetic. 

2. This statement is false, the beam is polyenergetic

3. This is true, the beam is polyenergetic

4. The statement is false. The beam is mono-energetic

2. This statement is false, the beam is poly energetic 

50/50

100

This option is most related to patient dose. 

1. OID

2. Film type

3. IR size

4. mAs

4.  mAs

200

The X-ray tube component that stops the stream of electrons and produces the X-ray beam is called the

1. cathode.

2. tetrode.

3. diode.

4. anode.

4. Anode 

300

As you position patients for various radiographic procedures, you will occasionally angle the X-ray tube central ray. This intentional use of tube angles is referred to as

1. size minification.

2. size distortion.

3. magnification.

4. shape distortion.

4. Shape distortion 

400

Given the three sets of mAs calculations below, all three should yield the same degree of radiographic exposure to a detector.
Exposure 1: 200 mA × 0.05 ms
Exposure 2: 100 mA × 0.10 ms
Exposure 3: 400 mA × 0.025 ms
This is known as

1. the deviation index.

2. mAs proportionality.

3. mAs reciprocity

4. the inverse square law.

3.  mAs reciprocity 

500

With respect to radiography, the best definition for a scintillation layer: 

1. This layer produces light in response to x-rays. 

2. This layer produces x-rays in response to light. 

3. This is nota term that is applicable to radiography. 

4. A layer that creates electrons within the x-ray tube. 

1. this layer produces light in response to x-rays.

Getting harder

100

The total quantity of X-ray photons produced during an exposure is determined by the

1. milliamperage (mA).

2. kVp.

3. mAs.

4. exposure index.

3.  mAs

200

X-ray beam intensity is reduced as it passes through object. This is called: 

1. Thermionic emission

2. There is no correct response 

3. Filtration

4. Infiltration

2. There is no correct answer

300

The reason a vacuum is useful for x-ray production: 

1. This is the site of x-ray production

2. Creates an unimpeded environment for electrons to flow from anode to cathode. 

3. Creates an unimpeded environment for electrons to flow from cathode to anode. 

4. This is the electron source

3. Creates an unimpeded environment for electrons to flow from cathode to anode.

400

Magnification increases as:

1. Magnification is not related to OID nor SID. 

2. OID increases

3. OID decreases

4. SID increases

2. OID increases 

500

As you perform a portable chest radiograph, the optimal SID of 40 inches is unattainable because of orthopedic supports over the patient. It is necessary for you to shorten the SID to 34 inches. A professional radiographer should do which of the following?

1. Use a shorter exposure time to improve resolution.

2. Prop the patient up to increase the distance 6 inches from the image receptor.

3. Angle the tube cephalad to compensate for the shorter SID.

4. Indicate the shorter SID on the examination notes to the radiologist.

4. Indicate the shorter SID on the examination notes to the radiologist.

Lets get you thinking

100

The purpose of filtration: 

1. Removes high energy photons

2. decreases operator dose as per ALARA

3. Increases patient dose

4. Removes low energy photons

1. Removes high energy photons 

200

The two main categories to express digital image quality are image resolution and

1. temporary resolution. 

2. source table distance. (SID)

3. image signal.

4. scanning frequency.

3. Image signal 

300

Temporal resolution is best described as the relationship between the dynamic motion of the anatomy and

1. signal differences between pixels.

2. acquisition time (exposure time).

3. signal strength.

4. kVp.

2. Acquisition time (exposure time)

400

The inverse square law in simple terms: 

1. Beam intensity increase as the distance from the source increases. 

2. Beam intensity decrease as the distance from the source increases. 

3. None of these is accurate 

4. Beam intensity decrease as the distance from the source decreases. 

2. Beam intensity decreases as the distance from the source increases 

500

Image brightness as seen on a viewing monitor is

1. not related to exposure and a feature of the monitor adjustments.

2. a function of the sensitivity of the radiographic film.

3. an indication of motion artifact

4. the result of underexposure to the image receptor.

1. Not related to exposure and a feature of the monitor adjustments.

Straight from McGibbons

100

The loss of radiographic image resolution is often referred to as unsharpness. All of the following contribute to total image unsharpness except the

1. image geometry factors such as OID,

2. size and shape of the patient’s anatomy.

3. image geometry factors such as SID,

4. size and shape of the exposure field (collimation).

4. Size and shape of the exposure field (collimation) 

200

As you review a radiographic image of the abdomen of a small child, you notice a small ring-like object on the image. It appears this object is in the patient’s stomach, which is consistent with the examination history. The ring shows on the X-ray image because of its metallic density. This is the result of

1. attenuation of the X-ray beam by the metallic density of the ring.

2. preferential absorption.

3. diffusion weighted absorption.

4. transmission of the X-ray beam through the soft metal of the ring.

1. Attenuation of the x-ray beam by the metallic density of the ring. 

300

Of all of the energy traveling through the X-ray tube during a radiographic exposure, the largest percentage of this electrical energy is converted to

1. x-radiation.

2. thermal energy (heat).

3. mechanical energy.

4. infrared energy.

2. Thermal energy (heat)

400

Sub-optimum mAs exposures in CR and DR imaging technology will yield an image that is

1. minified

2. magnified.

3. grainy and demonstrates quantum mottle.

4. dark on the display monitor in terms of brightness.

3. Grainy and demonstrates quantum mottle

500

Select the accurate statement. 

1.Both high and low contrast images display the same number of grey shades. 

2. There is no relationship between the number of grey shades and contrast. 

3. High contrast images display fewer shades of grey than low contrast images.

4. Low contrast images display fewer shades of grey than high contrast images. 

3. High contrast images display fewer shades of grey than low contrast images.