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A systems ability to respond to varying levels of exposure, including very minimal exposure, is referred to as:
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RAD217 Exam 1
Ch 1, 2, 3
| Question | Answer |
|---|---|
| A larger bit depth: | increases the number of shades of gray. |
| A systems ability to respond to varying levels of exposure, including very minimal exposure, is referred to as: | exposure latitude |
| The almost universally accepted standard for exchanging medical images is known as: | DICOM |
| the higher the number of pixels within a fixed FOV, the: | higher the image resolution |
| Select all that are true for edge enhancement: | It is high-pass filtering (boosts contrast of higher spatial frequencies) Can increase noise Improves visibility by increasing contrast along edges |
| All of the following are true regarding digital imaging except: | digital imaging systems produce a very narrow, non-linear exposure latitude. |
| Select all that are true for a PA Axial Caldwell skull: | the orbits are very round the superior orbital fissures are usually seen within the orbits the petrous ridges are in the lower third of the orbits the skull itself tends to appear a bit more oblong/oval due to the angular of the CR |
| Who was the first to incorporate digital imaging with the CT scanner? | Godfrey Hounsfield |
| A perfect image processing system would have an MTF of | 100% |
| What is the only view of the skull that will show all 4 paranasal sinuses? | Lateral |
| Digital image quality is improved with: | larger size matrix smaller size pixels |
| Multiple numeric values divided into an array of small elements capable of being processed is the definition of __________ imaging. | digital |
| Window level parameters control image | brightness |
| If the field of view is increased for a fixed matrix: | the pixel size is increased |
| A look-up table maps ________ and is the primary controller of digital image _________. | image grayscale values; contrast |
| Early PACS were first developed by | the US military |
| The more light spread, the ________ the MTF. | lower |
| The number of bits per pixel is known as bit: | depth |
| The measurement for radiation that was incident of the image receptor for a particular exposure is known as: | K^IND |
| CR acquires an image through | the use of a storage phosphor plate |
| Spatial resolution in digital imaging is primarily dependent on: | pixel size |
| The higher the DQE of a system, the radiation exposure necessary to produce a quality image is: | decreased |
| What is the BEST view for the ethmoid sinuses? | SMV |
| A continuously changing signal is known as: | analog |
| if a pixel has a bit depth of 9, the number of gray tones that pixel can produce is: | 512 |
| Which of the following statements is not true? | Exposure index refers to the amount of exposure to the patient. |
| Deviation index is a logarithmic expression of the difference between: | EI and EI^T K^TGT and K^IND |
| The efficiency of a system to convert x-ray input signal into a useful output image is known as: | Detective Quantum Efficiency |
| The ________ states that the sampling frequency must be no less that twice the frequency of the input signal. | Nyquist theorem |
| The first commercial CT scanners could image the: | head only |
| In the SMV (Schuller) projection, the mandible is: | at the top of the image |
| The more manipulation of the image, the greater the | loss of information |
| Which artifact can occur when the sampling frequency is not greater than twice the frequency of the input signal? | Aliasing |
| Select all statements below that are true regarding Air KERMA. | Units to quantify are Joule/kg or GYa Air KERMA stands for: Kinetic Energy Release in Mass of Air |
| The ability of a digital system to display subtle changes in shades of gray is called: | contrast resolution |
| A method of describing the strength of the useful radiation exposure compare with the amount of noise apparent in the digital image is the: | signal to noise ratio |
| A radiograph of an AP Axial projection of the cranium reveals that the foramen magnum, but the posterior arch of C1 is visible within the foramen. Which of the following positioning errors led to this radiographic outcome? | Excessive CR angulation |
| _________ 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 |
| The exposure latitude of digital projection radiography responds in a ___________ manner. | linear |
| The amount of detail present in any image is known as ________ resolution. | Spatial |
| Which of the following statements is true regarding digital imaging? | Digital systems have superior contrast resolution compared to film. Film as superior spatial resolution compared to digital. |
| Data collected within the collimation are represented by a | histogram |
| Raw data used to form the image histogram are compared with: | a normal histogram referenced by the computer |
| Which of the following is true regarding MTF? | It is impossible to achieve an MTF of 100% due to the noise inherent in a digital system |
| Overexposing a digital image receptor may result in a quality image but: | Alara principle has not been followed |
| How often the analog signal is sampled as it is digitized is the: | sampling frequency |
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