Computed and Digital Radiography Systems

These flashcards encompass key concepts, definitions, and important terminologies related to computed and digital radiography systems, focusing on efficiencies, types of imaging, and underlying principles.

Dual-Sided Reader

A device that collects light from both sides of an imaging plate, utilizing two sets of detectors.

Line Scan Reader

A type of reader that captures data from the entire line at once, as opposed to individual points.

Absorption Efficiency

The effectiveness of a detector in absorbing X-ray photons, expressed as a percentage of the total X-rays produced.

Conversion Efficiency

The percentage of energy from absorbed X-ray photons that is converted into light rather than wasted energy.

Emission Efficiency

The ability of light to escape from phosphor crystals and reach the light detector.

The F Center

Holes created when X-ray photons knock electrons out of their orbit, significant for forming latent images.

K Edge Effect

The phenomenon where incoming X-ray photons must have sufficient energy to dislodge electrons from atoms.

Artifacts

Unwanted irregularities in images caused by factors such as dust, dirt, or damage to the imaging plate.

Nyquist Theorem

A principle stating that the sampling rate must be at least twice the highest frequency detail of the image to prevent aliasing.

Aliasing

An artifact that occurs when the image is misrepresented due to an insufficient sampling rate.

Photoconductor

A material that converts X-ray energy directly into an electrical charge.

TFT Array

A matrix of thin film transistors used in direct conversion digital radiography to manage electrical signals.

Scintillation Layer

A layer that converts X-ray photons to visible light photons in indirect conversion systems.

Fill Factor

The proportion of the detector element's area that is sensitive to incoming radiation.

Direct Conversion

A method in digital radiography where X-rays are directly converted into electrical signals.

Indirect Conversion

A method in digital radiography where X-rays are first converted into visible light, which is then transformed into electrical signals.

Detector Element (DEL)

The smallest unit within a digital imaging detector, responsible for capturing X-ray information.

Amorphous Selenium

A photoconductive material used in direct conversion systems that directly converts X-rays into electrical signals.

Cesium Iodide

A scintillation material used in indirect conversion systems that improves spatial resolution by channeling light.

Gadolinium Oxysulfide

A less effective scintillation material that does not channel light, resulting in reduced spatial resolution.

Digital Imaging and Communications in Medicine (DICOM)

A standard for transmitting, storing, and sharing medical imaging information.