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5 Cards in this Set
- Front
- Back
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Define the key terms associated with digital imaging
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Digital Radiography- Filmless imaging system, computer file containing pictorial information
Digitize- convert image to digital form then processed by computer Pixel-discrete unit of digital information Sensor-Receptor for digital imaging Digital subtraction- one feature of digital radiography that can reverse the gray scale analog image- radiographic image produced on conventional film Charged-coupled device (CCD) -direct digital imaging -image receptor found w/in the intraoral receptor -intraoral sensor captures radiographic and transmits it to the computer monitor -software is used to enhance and store the image Storage phospor imaging (SPI) -indirect digital imaging -radiographic image recorded on phosphor-coated plate then scanned (converted to digital image) -images are stored and viewed on computer |
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Describe the purpose and use of digital imaging
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-diagnosis of dental disease
-detect lesions, diseases and conditions of the teeth and surrounding structures -confirm or classify suspected disease -provide information during dental procedures -evaluate growth and development -illustrate changes in disease status -document the condition of a patient at a specific patient in time |
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Discuss the fundamentals of digital imaging
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Digital Radiography:
-a method of capturing a radiographic image using a sensor, breaking it into electronic pieces, and presenting and storing the image using a computer Capturing the radiographic image: -a sensor is placed inside the mouth -x-ray beam strikes sensor -electronic charge is made producing image -image is digitized and viewed on computer Radiation exposure: -digital sensor is more sensitive to radiation than conventional film =exposure times are reduced by 50% to 80% in comparison to E speed film =1/100 of a second |
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List and describe the equipment used in digital imaging
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-X-radiation source
-Fiberoptic cable -Intraoral sensor (CCD) =a solid state detector that contains a silicon chip w/ an electric circuit embedded in it =silicone chip sensitive to x-ray or light =x-ray photons come in contact w/ CCD and cause electrons to be released from silicone resulting in an electrical charge -a latent image is made on receptor. it becomes digitized and viewed on computer Digital sensor: -a small receptor that is placed in the mouth of the patient and used to capture the radiograpic image =wired - the imaging sensor is linked by a fiberoptic cable to a computer =wireless- the imaging sensor is not linked by a cable Computer: -used to store the incoming electric signal -converts the electronic signal from the sensor into a shade of gray that is viewed on the computer monitor -the computer digitizes, processes, and stores info received from the sensor -has split screen and magnification capability Sensor prep: -Each sensor is sealed and waterproofed. the sensor must be covered w/ a disposable barrier bc it can't be sterilized Sensor Placement: -The sensor is held in the mouth by the bite-block attachments or devices (XCP) that aim the beam to the sensor |
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List and discuss the advantages and disadvantages of digital imaging
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Advantages:
-superior gray-scale resolution -reduced exposure to x-ray -increased speed of image viewing -lower equipment and film cost -increased efficiency -enhancement of diagnostic image -effective patient education tool Disadvantages: -Initial setup costs -image quality -sensor size -infection control legal issues |
