Podcast
Questions and Answers
What is the primary function of the reader (laser scanner) in an image system?
What is the primary function of the reader (laser scanner) in an image system?
- To capture the initial X-ray image.
- To replace traditional X-ray film.
- To print the image on medical film.
- To convert signals to digital form. (correct)
What is the role of the photo stimulable phosphor (PSP) coating on an imaging plate?
What is the role of the photo stimulable phosphor (PSP) coating on an imaging plate?
- To provide a barcode label for identification.
- To capture X-rays that have passed through the object being imaged. (correct)
- To allow the reader to read data on the plate without removing it from the cassette.
- To protect the imaging plate from damage.
In computed radiography (CR), what is the purpose of the laser scanner reader?
In computed radiography (CR), what is the purpose of the laser scanner reader?
- To read and digitize the image stored on the imaging plate. (correct)
- To increase the flexibility of patient positioning.
- To develop the film using chemical tanks.
- To replace the imaging plate.
What is the first step in the computed radiography (CR) process after the X-ray exposure?
What is the first step in the computed radiography (CR) process after the X-ray exposure?
What is the role of the photomultiplier tube in computed radiography?
What is the role of the photomultiplier tube in computed radiography?
After a CR image is acquired, which step allows for adjustments to be made to its contrast and brightness?
After a CR image is acquired, which step allows for adjustments to be made to its contrast and brightness?
What is the primary purpose of DICOM in digital imaging?
What is the primary purpose of DICOM in digital imaging?
Which of the following is an advantage of computed radiography (CR) over conventional radiography?
Which of the following is an advantage of computed radiography (CR) over conventional radiography?
What is a key disadvantage of computed radiography (CR)?
What is a key disadvantage of computed radiography (CR)?
Which component of a CR system is responsible for removing any residual latent image from the imaging plate after it has been read?
Which component of a CR system is responsible for removing any residual latent image from the imaging plate after it has been read?
What is the purpose of a barcode label on a CR cassette?
What is the purpose of a barcode label on a CR cassette?
In the context of digital imaging, which of the following best describes what is meant by 'digital imaging'?
In the context of digital imaging, which of the following best describes what is meant by 'digital imaging'?
What component of an image system captures the X-ray image in place of traditional X-ray film?
What component of an image system captures the X-ray image in place of traditional X-ray film?
In computed radiography (CR), what does the term 'latent image' refer to?
In computed radiography (CR), what does the term 'latent image' refer to?
Which of the following is a function of post processing in digital imaging?
Which of the following is a function of post processing in digital imaging?
What is the main advantage of using multiple sizes of cassettes in computed radiography (CR)?
What is the main advantage of using multiple sizes of cassettes in computed radiography (CR)?
What is the role of the conductive layer in a CR imaging plate?
What is the role of the conductive layer in a CR imaging plate?
What is the function of the light shielding layer in an imaging plate?
What is the function of the light shielding layer in an imaging plate?
What is the purpose of the light reflective layer in a CR imaging plate?
What is the purpose of the light reflective layer in a CR imaging plate?
Which component in the CR reader is responsible for converting the analog light signal from the imaging plate into a digital signal?
Which component in the CR reader is responsible for converting the analog light signal from the imaging plate into a digital signal?
In CR imaging, what happens when electrons in the imaging plate's photostimulable phosphor layer are irradiated by X-rays?
In CR imaging, what happens when electrons in the imaging plate's photostimulable phosphor layer are irradiated by X-rays?
Which of the following is a storage/retrieval element in digital imaging communication in medicine (DICOM)?
Which of the following is a storage/retrieval element in digital imaging communication in medicine (DICOM)?
What does the term 'image artifact' refer to regarding CR imaging plates?
What does the term 'image artifact' refer to regarding CR imaging plates?
How does CR contribute to reducing patient radiation exposure?
How does CR contribute to reducing patient radiation exposure?
What could be a consequence of over or under exposure during traditional radiography that CR helps to mitigate?
What could be a consequence of over or under exposure during traditional radiography that CR helps to mitigate?
What is the primary purpose of the protective layer on an imaging plate?
What is the primary purpose of the protective layer on an imaging plate?
Which type of light is used in the laser scanner?
Which type of light is used in the laser scanner?
Which of the following is a characteristic of digital imaging?
Which of the following is a characteristic of digital imaging?
How does computed radiography enhance diagnostic capabilities by adjusting digital brightness and contrast?
How does computed radiography enhance diagnostic capabilities by adjusting digital brightness and contrast?
Flashcards
Digital Imaging
Digital Imaging
Any image acquisition process that produces an electronic image viewable and manipulable on a computer.
Photo stimulable phosphor (PSP)
Photo stimulable phosphor (PSP)
A component of an image system that captures X-rays after they pass through the patient.
Computed Radiography (CR)
Computed Radiography (CR)
An indirect process designed to replace traditional screen/film radiography, using a cassette housing an imaging plate.
Computed Radiography (CR)
Computed Radiography (CR)
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Photomultiplier Tube
Photomultiplier Tube
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Post Processing
Post Processing
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DICOM
DICOM
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CR Advantages
CR Advantages
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CR Disadvantages
CR Disadvantages
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Study Notes
- Lecture one is titled digital photography techniques
Digital Imaging
- It is an image acquisition process
- It produces an electronic image
- The image is viewable and can be manipulated on a computer
Image System Components
- Photo stimulated luminescence screen (photo stimuable storage phosphor) captures X-ray images, replacing traditional film
- A reader (laser scanner) extracts the electronic latent image
- Digital electronics convert signals to digital form, creating a manifest image
- A printer is used to produce a medical film
Imaging Plate
- Computed Radiography is an indirect process replacing traditional screen/film radiography
- A cassette houses the imaging plate, replacing film to create images
- The cassette with the imaging plate goes under the patient during X-ray exposure
- The imaging plate has a photo stimulable phosphor (PSP) coating which captures X-rays passing through the patient
- The cassette has a barcode label, allowing the reader to read data on the imaging plate
Computed Radiography (CR)
- It runs the imaging plate through a laser scanner to read and digitize the image, rather than developing film in a darkroom
- CR utilizes cassettes of multiple sizes
- Detector size can be selected to match the procedure, increasing flexibility in positioning and exam area
Digital Radiography
- CR technology uses fluorescence imaging plates
- Plates contain photostimulable phosphor instead of traditional X-ray films for processing X-ray images
- X-rays irritate imaging plate electrons, generating and accumulating them in the photostimulable phosphor layer
- A laser scanner excites the image formed on the phosphor plate causing visible light emission proportional to accumulated X-rays
- A photomultiplier tube in the laser scanner converts this weak visible light into electrical signals, then digitally processes it to reconstruct an image
Post Processing
- Digital images can be viewed and enhanced
- Enhancement uses digital image processing software
- The software has features such as contrast, brightness, filtration, and zoom
Digital Imaging Communication in Medicine (DICOM)
- Computer software provides image solutions
- Modality interfaces such as bone and pulmonary interfaces
- Image processing to get the best image quality
- Storage and retrieval of images
- Print function
CR Advantages
- No silver-based film or chemicals are used; a computer is used instead
- A darkroom is not needed
- Images can be digitally enhanced to aid interpretation
- Image acquisition is faster (typically one minute) compared to conventional radiography (seven minutes)
- Fewer re-shots, reduced patient radiation, and reduced radiographer occupational exposure to radiation
- Adjusting image brightness and/or contrast enables examination of a wide range of tissue thicknesses with one exposure
- Images can be stored on disk or transmitted for off-site review
- DICOM output for integrated workstation and PACS system (picture archiving and communication system)
CR Disadvantages
- The possibility of digital manipulation of images leads to image unsharpness and lower spatial resolution
- Imaging plates are expensive and easily damaged, resulting in image artifacts
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