rad 102 main points chap 7

Primary Radiation

The useful x-ray beam produced at the x-ray tube and directed toward the patient.

Scatter Radiation

Radiation that occurs when primary x-ray photons interact with matter and change direction.

Remnant Radiation

The portion of the x-ray beam that exits the patient and reaches the image receptor.

Characteristics of Primary Radiation

Contains the highest energy photons, travels in straight lines, responsible for creating the radiographic image.

Methods to Reduce Scatter Radiation

Collimation, grids, air-gap technique, appropriate kVp selection, and patient shielding.

Effects of Too Little Receptor Exposure

Can cause quantum noise and grainy image.

Characteristics of Scatter Radiation

Travels in random directions, has lower energy than primary radiation, increases occupational exposure.

What is Remnant Radiation Also Called?

Exit radiation.

How Does Bone Affect X-Ray Exposure?

Dense structures absorb more photons and allow fewer photons to reach the receptor.

Image Receptor Exposure

The amount of radiation reaching the detector.

High Contrast

Characterized by few shades of gray and a black-and-white appearance.

Digital Radiography (DR) Advantages

Fast image acquisition, improved workflow, immediate image display, lower repeat rates.

What is the Purpose of Collimation?

To reduce scatter radiation.

Characteristics of Indirect Conversion Digital Radiography

Uses a two-step conversion process with high detective efficiency.

Effects of Too Much Receptor Exposure

Excess patient dose and potential detector saturation.

How Are Latent Images Formed in CR?

Electrons become trapped in higher-energy states when x-ray photons interact with the PSP plate.

Contrast Resolution

The ability to distinguish small differences in tissue density.

What Is Meant by Spatial Resolution?

The ability to visualize small structures distinctly.