P10 - Digital Imaging

Latitude

Margin of error

Increased mAs and patient dose

What is the downside of latitude?

Less

Conventional radiography has _____ dose to the patient (more efficient process) per exposure

Less

Conventional radiography needs _____ mAs

Less

When utilizing digital imaging, the overall population will be exposed to _____ radiation as a whole or on average compared to conventional radiography

Monitors

Medical-grade _____ have embedded sensors that monitor and adjust backlight levels

Luminance uniformity

Medical-grade monitors have better _____ (~15%) across the viewing surface

Exposure Index

A numeric representation of the quantity of exposure received by a digital image receptor

mAs creep

The exposure index is used to avoid _____

True

T/F We can't identify overexposure on most digital images

Repeat log

A log with mAs and kVp should be kept for all exposures (unless using an automatic exposure control (AEC))

Repeat exposure

Repeat exposure log explains when a _____ was performed

10%

The repeat log is recommended to be about _____ retakes

>10%

_____ is thought to be too many and trends as to why the high retake rate should be identified

<10%

_____ raises concern that retakes are not being taken when they should be

Quantum mottle

Grainy/dotted image

Digital image receptor

What were these images captured by?

Screen/film

What were these images captured by?

- Create image

- Capture image

- Process image

- Present/display image

- Manually transport image from place to place

State the steps of conventional radiography (screen/film)

Computed radiology (CR)

- Cassette-based digital radiography

- Digital acquisition modality that uses storage phosphor plates to produce images

- FUJI

- AGFA

State the best types of computed radiology

- Create image in space

- Capture image

- Process image

- Print image

- Present image

- Distribute image

State the steps of computed radiology

Direct radiology (DR)

- Does not use cassettes

- Do NOT purchase

- Quality systems are very expensive

- Cheaper systems are less quality than CR and still usually more money

- Capture image

- Process image

- Print image

- Present image

- Distribute image

State the steps of direct radiology

CCD DR

- Charged-coupled device

- Digital signal converter

- For DR

Flat panel direct radiology

_____ is the highest quality image that is possible with the least amount of radiation to the patient