Chapter 3: Radiation

When a technical exposure factor of 100 kVp is selected, with of the following occurs

The beam will contain photons having energies of 100 keV or less, with an average effective energy of approximately 33 keV

The passage of primary X-rays photons through a patient without interaction in body tissue is called

Direct transmission

In which of the following X-ray interactions with matter is the energy of the incident photon completely absorbed

Photoelectric

What is the result of coherent scattering

Usually just a small angle change un the direction of the incident photon

A technical exposure factor of 100 kVp means that the electrons bombarding the target of the xray tube have a maximum energy of

100,000 eV or 100 keV

A Compton scattered electron

Is absorbed within a few microns of the site of the original Compton interaction

Most scattered radiation produced during radiographic procedures is the direct result of which of the following

Compton interactions

When primary photons in the xray beam are decreased through the processes of absorption and scatter as the beam passes through the patient in its path BLANK occurs

Attenuation

Before interacting with matter, an incoming xray photon may be referred to as which of the following

Primary photon

Within the energy range of diagnostic radiology (23 to 150 kVp), which also includes mammography, when kVp is decreased, the patient dose

Increases

Which of the following statements best describes mass density

It is measured in grams per cubic centimeter

Of the following interaction between x radiation and matter, which only occur above the range of diagnostic radiology

1. Photoelectric absorption

2. Pair production

3. Photodisintegration

2 and 3 only

For a diagnostic radiologic examination, the selection of technical exposure factors using an optimal kVp and mAs combination

Produces an xray image of acceptable quality while minimizing patient dose

The quality, or penetrating power, of an xray beam is controlled by

kVp

Small angle scatter

Degrades the appearance of a completed radiographic image by blurring the sharp outlines of dense structures

Within the energy range of diagnostic radiology, as absorption of electromagnetic energy is biologic tissue increases, the potential for biologic damage

increases

Which of the following terms are synonymous

1. Coherent scattering

2. Classical scattering

3. Unmodified scattering

1, 2, and 3

Noninteracting and small angle scattered photons comprise

Exit, or image formation, radiation

Direct transmission means that xray photons

Pass through biologic tissue without interaction

Which of the following has the same mass and magnitude of charge as a negatron

Positron

Which of the following interactions between x radiation and matter does not occur within the range of diagnostic radiology

Pair production

kVp controls

Quality, or penetrating power, of the xray photons in the beam

Primary radiation is synonymous with

Direct radiation

Which of the following are radiographic image receptors

1. Radiographic grid

2. Digital image receptor

3. Phosphor plate

2 and 3 only

The process most responsible for the contrast between bone and soft tissue in a diagnostic radiographic image is

Photoelectric absorption