Ch 08 Digital Radiography

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13 Terms

1

Benefits and Challenges of Digital Radiography

  • Benefits: Quick image display, less radiation, easier storage.

  • Challenges: Equipment cost, need for computer storage, sensor fragility.

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2

Equipment for Digital Radiography

Needs: x-ray machine with short exposure time, sensor or plate, computer with monitor and storage capacity.

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3

Characteristics of a Digital Image

  • Digital images are made of pixels, with more pixels meaning clearer images.

  • Gray scale (shades of gray) helps show subtle details in x-rays.

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4

Types of Digital Image Receptors

  • Direct (sensor sends image directly to the computer)

  • Indirect (plate must be scanned to create an image).

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5

Direct Digital Imaging

Uses sensors (CCD or CMOS) to instantly send the image to a computer screen.

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6

Sensor Types and Range

  • CCD sensors have a narrow range and capture more detail.

  • CMOS sensors are often wireless but with a narrower range.

  • PSP sensors have the widest range

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7

Wireless Sensor Limitations

Convenient but can be affected by other signals and are more expensive than wired options.

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8

Sensor Sizes

Sensors come in sizes (0,1,2) similar to film and may have contoured edges for comfort.

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9

Indirect Digital Imaging (PSP)

PSP plates capture images that must be scanned to display on a computer, without a direct connection.

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10

PSP Image Storage

PSP plates store x-ray energy as a hidden image, which a scanner reads to create a digital image.

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11

PSP Scanning Process

Plates are placed in a scanner, which uses a laser to read and display the image on a monitor.

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12

PSP Limitations

PSP images take longer to produce, have lower resolution, and plates need clearing before reuse.

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13

Radiation Exposure

CMOS sensors need less radiation than CCD and PSP sensors.

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