16 Questions
What is the function of compression and magnification in mammography?
Compression reduces thickness and spreads out tissue, while magnification helps to visualize small details and lesions.
How does subject contrast in breast imaging differ from conventional radiography?
In breast imaging, breast tissues intrinsically lack subject contrast, as they have similar effective atomic numbers and density, unlike the large difference in mass density and atomic number among bone, muscle, fat, and lung tissue in conventional radiography.
What is the difference between conventional screen-film mammography and digital mammography?
Conventional screen-film mammography uses photographic film, while digital mammography captures and stores the images electronically.
What is breast tomosynthesis and its function in breast imaging?
Breast tomosynthesis is a 3D imaging technique that produces multiple images of the breast tissue at different angles, helping to improve the detection of lesions and reduce false positives.
How can image quality in mammography be improved?
Image quality in mammography can be improved by enhancing differential absorption in very similar breast tissues and reducing overlapping structures through techniques like breast tomosynthesis.
Why do breast tissues require specific design features in mammography?
Breast tissues require specific design features in mammography to enhance differential absorption in very similar tissue, as they intrinsically lack subject contrast.
What is the major disadvantage of using low kVp technique in breast imaging?
High absorption of low energy x-rays in the breast, contributing to patient dose
What is the purpose of compression in mammography?
To bring the breast structure close to the image receptor and improve visibility of detail
What is the anode heel effect in mammography?
The radiation intensity near the chest wall must be higher than that near the nipple area to allow uniform exposure of the image receptor
What is the main advantage of using compression in mammography?
Increased radiographic contrast
What is the purpose of geometric magnification in mammography?
To produce the least amount of blurring and enhance visibility of calcifications and small breast structures
What is the required magnification factor for magnification mammography?
1.5x and 1.8x @ 2.0x
How does compression affect the scatter-to-primary exposure ratio?
It reduces the scatter-to-primary exposure ratio by half
What is the purpose of achieving the right balance of contrast, resolution, and radiation exposure in breast imaging?
To ensure adequate image quality with the lowest absorbed dose compatible with diagnostic requirements
What is the main benefit of using magnification in mammography?
Increase the size of the projected anatomic structures compared to the granularity of the image
Why is it important to have a broad dynamic range in breast imaging?
Due to the composition of the breast and age-dependent changes, details as fine as 50 μm must be adequately visualized
Learn about the imaging process of mammography in this lecture by Nur Hamizah Mohd Zainudin (PhD), covering topics such as compression, magnification, screen film mammography, digital mammography, and tomosynthesis. Understand the differentiation between general radiography imaging and breast imaging using mammography, and the functions of compression and magnification in mammography.
Make Your Own Quizzes and Flashcards
Convert your notes into interactive study material.
Get started for free
