Question 1

The two active components of an X-ray tube are:&#10;A) a positive cathode and a negative anode&#10;B) a negative cathode and a positive anode&#10;C) the X-ray tube housing and the collimator&#10;D) the spinning target and a vacuum

Accepted Answer

The two active components of an X-ray tube are a negative cathode, which emits electrons when heated, and a positive anode, which attracts these electrons and upon their impact produces X-rays.

Question 2

The energy conversion that occurs inside the X-ray tube results in the production of which two forms of energy?&#10;A) Anode and cathode&#10;B) X-rays and light&#10;C) Heat and light&#10;D) Heat and X-rays

Accepted Answer

Inside the X-ray tube, the energy conversion primarily results in the production of heat and X-rays. Most of the kinetic energy of the electrons is converted into heat, while a small portion is converted into X-rays.

Question 3

The invisible image contained on the imaging plate is made visible following scanning with what type of energy?&#10;A) Electrons&#10;B) X-rays&#10;C) Laser beam&#10;D) Heat

Accepted Answer

The invisible image on the imaging plate is made visible by scanning it with a laser beam. This process is part of digital radiography, specifically in computed radiography (CR) systems, where the imaging plate captures the image, and then a laser is used to read this image by stimulating the phosphors to emit light, which is then converted into a digital image.

Question 4

Computed radiography makes use of:&#10;A) high speed intensifying screens&#10;B) an imaging plate coated with a photostimulable phosphor&#10;C) dual emulsion film&#10;D) direct digital imaging plate

Accepted Answer

Computed radiography utilizes an imaging plate coated with a photostimulable phosphor to capture images. When the plate is exposed to X-rays, it stores the image, which can then be read by a special scanner that converts the information into a digital image.

Question 5

Contrast on a radiograph is possible only when the object being radiographed has:&#10;A) the proper kilovoltage applied&#10;B) an inherent difference in the atomic number of the object&#10;C) a sufficient amount of milliamperage&#10;D) the area of the X-ray beam coverage

Accepted Answer

Contrast in a radiograph is primarily determined by the difference in the atomic number of the materials being imaged. Higher atomic number materials absorb more X-rays and appear lighter on the radiograph, creating contrast with materials of lower atomic numbers.

Question 6

mAs is adjusted to control the:&#10;A) penetrating quality of the X-ray beam&#10;B) amount of X-rays produced&#10;C) contrast of the radiographic image&#10;D) area of the X-ray beam coverage

Accepted Answer

The milliampere-seconds (mAs) setting on an X-ray machine controls the amount of X-rays produced. Increasing the mAs increases the number of X-ray photons generated, which affects the overall exposure of the radiographic image.

Question 7

kVp is adjusted to control the:&#10;A) radiographic contrast&#10;B) energy of the beam&#10;C) penetrating quality of the beam&#10;D) all of the above

Accepted Answer

Kilovoltage peak (kVp) affects the radiographic contrast, the energy of the X-ray beam, and the penetrating quality of the beam. Higher kVp increases the beam's energy and penetration, and also affects the contrast of the image.

Question 8

Radiographic densities listed from least dense to most dense are:&#10;A) air, muscle, fat, bone&#10;B) fat, air, bone, muscle&#10;C) air, fat, muscle, bone&#10;D) air, fat, bone, muscle

Accepted Answer

Radiographic densities increase from air (least dense), to fat, to muscle, and finally to bone (most dense). This order is important for interpreting various shades of gray in radiographic images.

Question 9

Intensifying screens will increase the density by approximately:&#10;A) 10% to 20%&#10;B) 5% to 10%&#10;C) 15% to 30%&#10;D) 20% to 40%

Accepted Answer

Intensifying screens significantly increase the density of the image on the radiographic film, often by about 20% to 40%. They do this by converting the X-ray photons into light, which exposes the film more efficiently than direct X-ray exposure alone.

Question 10

Visibility of detail on a radiograph is:&#10;A) improved by decreasing the distance&#10;B) improved by enlarging the field size&#10;C) improved by a radiographic grid&#10;D) improved by reducing the mass

Accepted Answer

A radiographic grid improves the visibility of detail by reducing scatter radiation, which enhances image contrast.

Question 11

Dynamic X-ray studies of the body are produced by which imaging modality?&#10;A) Plain film radiography&#10;B) Magnetic resonance imaging&#10;C) Diagnostic medical sonography&#10;D) Fluoroscopy

Accepted Answer

The answer of Dynamic X-ray studies of the body are...

Question 12

Dynamic studies of the body using radiopharmaceuticals are produced by which imaging modality?&#10;A) Positron emission tomography&#10;B) Magnetic resonance imaging&#10;C) Computed tomography&#10;D) Fluoroscopy

Accepted Answer

The answer of Dynamic studies of the body using radiopharmaceuticals...

Question 13

A portable fluoroscope is also called a:&#10;A) mobile scanner&#10;B) c-arm&#10;C) tomography unit&#10;D) PACS

Accepted Answer

The answer of A portable fluoroscope is also called a:&#10;A)...

Question 14

Sound is used to visualize internal structures of the body using which imaging modality?&#10;A) Sonography&#10;B) Positron emission tomography&#10;C) Magnetic resonance imaging&#10;D) Fluoroscopy

Accepted Answer

The answer of Sound is used to visualize internal structures...

Question 15

A magnetic field and radio wave transmissions are used in which of the following imaging modalities?&#10;A) Digital radiography&#10;B) Magnetic resonance imaging&#10;C) Computed tomography&#10;D) Nuclear medicine

Accepted Answer

The answer of A magnetic field and radio wave transmissions...

Deck 8: The Technology of Medical Imaging