Podcast
Questions and Answers
What is the primary goal of conventional tomography?
What is the primary goal of conventional tomography?
- To improve the resolution of soft tissue images
- To increase the speed of image acquisition
- To enhance overall image brightness
- To eliminate unwanted structures above and below the focal plane (correct)
Which of the following statements is true regarding the limitations of radiographic film and tomography?
Which of the following statements is true regarding the limitations of radiographic film and tomography?
- They can perfectly image differences in subject contrast for soft tissue.
- They can adjust contrast after it is recorded.
- Tomography eliminates all unwanted planes without any issues.
- Radiographic film typically discriminates x-ray intensity differences of 5% to 10%. (correct)
What type of imaging modality allows for alteration of contrast after the image is recorded?
What type of imaging modality allows for alteration of contrast after the image is recorded?
- Conventional radiography
- Digital imaging modalities like CT (correct)
- Ultrasonography
- Plain film tomography
What is a common use of CT beyond medical applications?
What is a common use of CT beyond medical applications?
What characteristic makes CT scans superior to traditional radiography in terms of image creation?
What characteristic makes CT scans superior to traditional radiography in terms of image creation?
What challenge remains a persistent issue even with the use of tomography?
What challenge remains a persistent issue even with the use of tomography?
What type of geometry creates challenges for image quality in conventional tomography?
What type of geometry creates challenges for image quality in conventional tomography?
Which physical element affects the ability of radiographic film to differentiate between soft tissue contrasts?
Which physical element affects the ability of radiographic film to differentiate between soft tissue contrasts?
Flashcards
Conventional tomography
Conventional tomography
A technique that overcomes image superimposition by blurring unwanted structures while keeping the desired layer in focus.
Focal plane
Focal plane
The plane of interest in tomography, where the structures are in focus.
Geometric tomography
Geometric tomography
A type of tomography where the X-ray tube and film move simultaneously in opposite directions.
Image blurring limitation
Image blurring limitation
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Image contrast degradation
Image contrast degradation
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Limitation of radiography and tomography
Limitation of radiography and tomography
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Computed tomography (CT)
Computed tomography (CT)
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Multi-planar reformatting
Multi-planar reformatting
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Study Notes
Superimposition in Radiography
- Conventional tomography aims to reduce superimposition by moving X-ray tube and film simultaneously, focusing on a desired layer.
- However, some blurring remains, and not all unwanted structures are eliminated.
- Limitations also include image contrast degradation due to scattered radiation.
- Film-screen combinations limit detection of subtle contrast differences in soft tissue.
Conventional Tomography Limitations
- Image blurring persists.
- Scattered radiation degrades contrast.
- Film-screen combinations limit soft tissue contrast discrimination.
Digital Imaging Modalities
- Digital imaging (like CT) allows contrast adjustment after image capture.
- CT systems provide cross-sectional images, reducing structure overlap.
- CT offers significantly higher sensitivity to x-ray attenuation differences (a factor of 10 better than film).
- CT images can be reformatted into multiple planes and 3D views.
Applications of CT
- Diagnostic, treatment planning, interventional, and screening purposes in medicine.
- Used in nondestructive materials testing and studies of biological/paleontological specimens.
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