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RAD217 Quiz 1
| Question | Answer |
|---|---|
| ________ is a set of values, established by either the system manufacturer or the system user, that represents an optimal exposure for each specific body part and view. | K^TGT |
| Which radiographic image capture method uses an x-ray absorber material coupled to a thin film transistor to form the digital radiographic image? | Flat panel detector |
| Digital image quality is improved with: (select 3) 1. Larger pixel size 2. smaller pixel size 3. larger matrix size 4. smaller FOV 5. larger FOV 6. smaller matrix size | 2, 3, 4 |
| Which radiographic image capture method uses chemical development to produce the manifest image? | Film/screen radiography |
| A larger bit depth: | increases the number of shades of gray. |
| Each square in a matrix is called a: | pixel |
| Spatial resolution in digital imaging is primarily dependent on: | pixel size |
| The first full-scale PACS was installed in 1993 in: | VA Hospital, Baltimore |
| The acronym PACS stands for __________ system. | picture archival and communication |
| Multiple numeric values divided into an array of small elements capable of being processed is the definition of _______ images. | digital |
| The ability of a digital system to display subtle changes in shades of gray is called: | contrast resolution |
| The first commercial CT scanners could image the: | head only. |
| A combination of rows and columns (array) of pixels is called a: | matrix. |
| The exposure latitude of digital projection radiography responds in a ________ manner. | linear |
| If the matrix size is increased for a fixed field of view (FOV): | the pixel size is decreased. |
| Which of the following will be present on the image in the image receptor does not receive adequate exposure? | quantum noise |
| Air kerma is the measurement of radiation energy absorbed in a unit of air. The SI unit used to quantify this is the: | Gray (Gy) |
| Which modality was the first to use the principle of digital imaging? | Computed tomography (CT) |
| In digital radiography, contrast is primarily controlled by | image processing look-up table (LUT) |
| A system with a 1024x1024 matrix will have how many pixels? | 1,048,576 |
| The number of bits per pixel is known as bit: | depth |
| What standard format must images be in order to be sent throughout the image viewing system? | DICOM |
| Which of the following best describes the sequence for PSP image capture? | Phosphor plate, focused laser light scanner, photomultiplier, analog-digital converter, review station |
| If a pixel has a bit depth of 9, the number of gray tones that pixel can produce is: | 512 |
| The amount of detail present in any image is known as ________ resolution. | Spatial |
| A continuously changing signal is known as: | analog |
| CR acquires an image through: | the use of a storage phosphor plate. |
| The almost universally accepted standard for exchanging medical images is known as: | DICOM |
| All of the following are true regarding digital imaging except: | digital imaging systems produce a very narrow, no-linear exposure latitude |
| Teleradiography incorporated _________ to produce radiographic images. | telephone lines |
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