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imaging
imaging Dakota
| Question | Answer |
|---|---|
| The reflective layer______ | Sends light in a forward direction |
| Thin film transistor is the electronic gate keeper used in flat panel technology? | True |
| The longer an image is stored in the computed radiography (CR) cassette, the: | More energy is lost. |
| A voxel is a representation of the image data | False |
| The wavelength of the CR reader laser is _________ nm | 670-690 |
| Flat-panel detectors that use indirect conversion technology convert: | X-rays to visible light |
| The laser scans the imaging plate in a __________pattern | Raster |
| The purpose of the barcode label is to identify the | imaging plate |
| The phosphor layer is made of phosphors from the _______family. | Barium Fluorohalide |
| CR acquires an image through: | the use of a storage phosphor plate |
| A device that acts like a switch to send electrical charges to the image processor in a direct conversion flat-panel detector is known as a ________transistor. | Thin-Film |
| The layer of the imaging plate that traps electrons during exposure is the ____layer | Active |
| Photodiode converts light energy into electrical current. | True |
| What color of light is emitted by a computed radiography photostimulable phosphor plate after stimulation by solid state diode laser light? | Blue |
| The indirect conversion system that requires optical coupling and image size reduction is known as a: | CCD |
| DQE | The ability of a detector element (del) to absorb x-rays or light: its sensitivity to photons. |
| Active Matrix Array | A panel of electronic detector elements laid out in rows and columns: used to convert incoming light or x-ray photons into an electrical signal. |
| CCD | A flat, compact light sensing device that uses a single layer of silicon as its sensitive surface, used for recording images. |
| Conductor | Material that allows the efficient transfer of heat or electricity. |
| Del | Acronym for "detector element" an individual hardware cell in a DR image receptor, capable of producing a single electronic readout from incoming photon (light or X-ray) energy. |
| Fill Factor | The percentage of a detector element's area dedicated in photon absorption. |
| Which of the following measures best determines the performance of a flat-panel detector? | DQE |
| The amount of detail present in any image is known as ________resolution. | Spatial |
| Which of the following is used asa photoconductor? | a-Se |
| The x-ray absorber typically used in direct capture DR is a: | Photoconductor |
| When using a photostimulable phosphor plate to capture the remnant beam, what processes the electrical signal from the photomultiplier and produces a digital image? | Analog to digital converter. |
| The components that focus the signal from the scintillators to the CCD are called: | Fiber optics |
| Each square in a matrix is called | Picture element |
| A turbid scintillation crystal produces: | light spread |
| The purpose of the barcode label is to identify the ______. | Imaging plate |
| Scintillators are phosphors that: | produce light when absorbing x-rays |
| Photoconductors are materials that: | absorb x-rays and produce electrical charges. |
| The type of flat-panel detector that uses thin films of silicon integrated with arrays of photodiodes is known as a(n): | amorphous silicon detector |
| Photo conductor material conducts electricity when illuminated by x-ray photon's. | True |
| Which of the following is not considered a scintillator? | a-Se |
| The imaging plate reader uses a laser to scan the imaging plate, releasing the energy stored in the conductive layer as ______ light. | Blue |
| Fluorescence | Immediate emission of light under stimulation |
| Laser | Light amplification by stimulated emission of radiation |
| Matrix | The collective rows and columns of pixels or dexels that make up the area of an image or Image receptor. |
| Phosphorescence | Delayed emission of light. |
| Similar to CR, DR can use the existing diagnostic equipment found in today's imaging departments. | False |
| The two elements needed to convert light signals into an electrical signal while using indirect capture DR are TFT and: | photodiodes |
| In reference to PSP image capture, to release the latent image, which of the following devices is scanned over the phosphor plate? | Focused laser light |
| CR imaging plates are erased by flooding the plate with __________. | Light |
| The longer an image is stored in the computed radiography (CR) cassette, the: | more energy is lost |
| What is selected in order for the computer processor to control image contrast? | LUT or look up table |
| Grossly overexposed digital images will demonstrate: | loss of contrast |
| In digital imaging, kVp selection has an effect on 1. Photon energy 2. Penetration 3. Image contrast | 1 and 2 only |
| Describe Exposure Latitude | These were fill in the blank which my answer was: this is the margin of error for an image. Which for film it is -30 to +50, while dr and cr it is -50 to +400 percent error. |
| Describe dynamic range | These were fill in the blank which my answer was: this is what the computer has inputted to make every xray or histogram into a perfect one. This gived you the range of what pixels and how they are arranged. |
| Digital imaging systems cannot compensate for; | too low kVp |
| When a single 15% step increase in kVp is accompanied by a halving of the mAs, the absorbed dose to the patient is: | reduced |
| which of the following groups of technical factors will deliver the greatest patient dose? | 160 mAs, 70 kVp |
| Quantum mottle is not a form of noise | False |
| The only quality not tampered with by digital processing is | Shape distortion |
| Radiography is the best profession ever!!! | True |
| The electronic term used to describe anything that interferes with visualization of the x-ray image is | Noise |
| Exposure factors of 2 mAs and 75 kVp were used for a particular part. Which of the following changes would result in twice the exposure to the image receptor | 4 mAs |
| In the digital age, the main role of radiographic technique is to; | ensure that adequate signal reaches the detector |
| By reducing the mAs by 1/2 and increasing kVp 15% there is a reduction in ESE and absorbed dose by | 1/3rd |
| How are mAs and patient dose related? | mAs and patient dose are directly proportional |
| Increasing mAs will compensate for the lack of kVp. | False |
| In the digital age, anatomy smaller than _____ cm should no longer be imaged using a grid. | 13 cm |
| An increase in kilovoltage will | increase photon energy |
| Which of the following factors influence's the production of scatter radiation? 1. Kilovoltage level 2. Tissue density 3. Size of field | 1,2 and 3 |
| Describe subject contrast | These were fill in the blank which my answer was: this is the density of the different tissues in the body and also the amount of absorption of the different tissues in the body from the remant beam |
| For all digital imaging systems, a lower limit for exposure to the receptor is imposed by: | the appearance of mottle |
| How much over-exposure is required before a digital imaging system becomes overwhelmed with data, causing saturation to occur. | 8-10 times |
| Misunderstanding about radiographic technique an the nature of digital imaging, combined with the extremely broad exposure latitude of digital imaging systems, has lead to what problem.? | Dose creep |
| Virtual grid software has been clinically demonstrated to; | all of these |
| In digital imaging, mAs selection has an effect on 1. receptor exposure 2. patient dose 3. brightness | 1 and 2 only |
| An appropriate exposure range that will produce a quality image while delivering acceptable patient dose defines. | exposure latitude |
| S/N is the ratio of signal and noise | True |
| Describe what an Exposure Indicator is. | These were fill in the blank which my answer was: This is a number that will show on how much of the beam was receieved from the exposure. There is a range allowing to see if it was over exposed or underexposed with this number for the exposure. |
| Describe appropriate selection of exposure factors for a digital system | This was fill in the blank, which will be based on your clinic site. |
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