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Radiography
Chapter 8 Digital Imaging
| Question | Answer |
|---|---|
| What does digital imaging use to produce an image? | An electronic sensor and computerized imaging system |
| What term is used to describe the pictures that are produced during digital imaging? | Image |
| Digital images require exposure times that are ________ than that required for conventional film-based radiography. | 50% to 90% less |
| What do most digital imaging systems use as the x-radiation source? | A conventional dental x-ray unit |
| In order to be used for digital imaging, the x-ray unit timer must be adapted to allow exposures in a time frame of _______ of a second. | 1/100 |
| What are the distinct units of programmable gray values in a digital sensor that are sensitive to x-rays called? | Pixels |
| How many shades of gray can the human eye distinguish? | 32 |
| What can be done to the digital sensor to further protect it from cross contamination? | Cover the sensor with a finger cot before putting on the barrier sleeve. |
| What technique would you use for placing the digital sensor in your patient’s mouth? | The same placement technique than you would normally use when placing a traditional film. |
| What technique uses a reusable imaging plate? | Storage phosphor imaging |
| How are the images cleared from the photo-stimulable phosphor (PSP) imaging plates? | By a clearing step within the scanner. |
| Why is digital imaging preferred over traditional film? | The image appears almost instantaneously |
| What is a primary advantage of digital imaging? | Superior gray-scale resolution |
| Digital imaging uses up to _______ shades of gray. | 256 |
| How many shades of gray does conventional film use? | 16 to 25 |
| Digital imaging manufacturers maintain a range of 6 to 22 line pairs/millimeter (lp/mm) and the human eye can recognize about __ lp/mm. | 8 |
| Since digital sensors cannot be sterilized, how do we care for them? | They require complete coverage with disposable plastic sleeves for each patient. |
| Why might digital images not be able to be used as evidence in lawsuits? | Because the original digital image can be enhanced. |
| The human eye can resolve 8 to 10 lp/mm and most CCD systems maintain a range of ___________, making them adequate to diagnose disease. | 6 to 22 lp/mm |
| The majority of research has shown that what type of performs at least as well as and, at times, even better than traditional radiographs? | Digital images |
| What is an advantage of using digital imaging? | An increase in interactive dialogue between the patient and the radiographer. |
| With the feature of _______________, the gray-scale of the diagnostic image is reversed so that radiolucent images appear white and radiopaque images appear black. | Digital subtraction |
| What would be a reason to switch from film-based dental radiography to direct digital imaging? | Digital images can be printed when needed. |
| A sensor with a fiber optic cable linked to the computer that is placed into the mouth of the patient and exposed to x-radiation is an example of what? | Direct digital imaging. |
| How does the CMOS detector differ from the CCD detector? | The CMOS detector is silicon-based and differs from the CCD detector in the way that the pixels are read |
Created by:
BrendaAlberts