Background A mammogram is an x-ray of the breast. A screening mammography is one of several tools that are used for early detection of breast cancer in asymptomatic women.
History[ edit ] X-ray tomosynthesis concept of tomosynthesis was derived from the work of Ziedses des Plantes, who developed methods of reconstructing an arbitrary number of planes from a set of projections. Though this idea was displaced by the advent of computed tomography, tomosynthesis later gained interest as a low-dose tomographic alternative to CT.
Due to partial data sampling with very few projections, approximation algorithms have to be used. Filtered back projection and iterative, expectation-maximization algorithms have both been used to reconstruct the data.
Iterative algorithms based upon expectation maximization are most commonly used, but are computationally intensive. Some manufacturers have produced practical systems using off-the-shelf GPUs to perform the reconstruction in a few seconds.
However, though there X-ray tomosynthesis some similarities to CT, it is a separate technique. Digital tomosynthesis, on the other hand, only uses a limited rotation angle e. This incomplete set of projections is digitally processed to yield images similar to conventional tomography with a limited depth of field.
Because the image processing is digital, a series of slices at different depths and with different thicknesses can be reconstructed from the same acquisition.
However, since fewer projections are needed than CT to perform the reconstruction, radiation exposure and cost are both reduced. In DBT, like conventional mammography, compression is used to improve image quality and decreases radiation dose. The laminographic imaging technique dates to the s and belongs to the category of geometric or linear tomography.
However, the higher resolution detectors permit very high in-plane resolution, even if the Z-axis resolution is less.
The primary interest in DBT is in breast imaging, as an extension to mammographywhere it offers better detection rates with little extra increase in radiation.
Please expand the section to include this information. Further details may exist on the talk page. July Musculoskeletal imaging[ edit ] Tomosynthesis has a much more limited depth of field than does CT.
For this reason, it likely will not be able to replace CT for the evaluation of the deeper organs of the body. However, since bones are often near the skin, multiple musculoskeletal applications of tomosynthesis have been studied, most of which have mostly been used in research with limited use in everyday practice.
Evaluation of fractures[ edit ] Tomosynthesis has been compared to both radiography and CT for the evaluation of healing fractures, especially in the presence of hardware.
In a study of patients with wrist fractures, digital tomosynthesis was shown to enable detection of more fractures than radiography while simultaneously providing lower metal artifact than radiography.
The radiation dose of digital tomosynthesis was very close to that of digital radiography. Technical Principles and Clinical Update". European Journal of Radiology. Physics in Medicine and Biology.Tomosynthesis, also digital tomosynthesis (DTS), is a method for performing high-resolution limited-angle tomography at radiation dose levels comparable with projectional radiography.
It has been studied for a variety of clinical applications, including vascular imaging, dental imaging, orthopedic imaging, mammographic imaging, musculoskeletal. XRANM offers a comprehensive range of diagnostic imaging procedures that cover all the modalities in radiology. For over 65 years, X-Ray Associates of New Mexico, PC has made diagnostic imaging available throughout the state.
Advanced Application Technology Top. Tomosynthesis, making the invisible visible.
|What is “Tomosynthesis” ?||NYT article on new study. Other studies outline many pros and cons of 3d Mammograms, including the usefulness in dense breasts and issues with insurers not repaying the technology.|
Tomosynthesis, making the invisible visible ”Tomosynthesis” is a coined term from ‘Tomography’ and ‘Synthesis’. Reduce Examination Time and X-ray Dose. Tomosynthesis: Tomosynthesis is a special kind of mammogram that produces a 3-dimensional image of the breast by using several low dose x-rays obtained at different angles.
For tomosynthesis, the breast is positioned and compressed in the same way as for a mammogram but the x-ray tube moves in a circular arc around the breast. Windsong Radiology Group has five locations to serve our patients throughout Western New York and Southern Ontario.
Our Interventional Radiology minimally invasive procedure suite is located at our Williamsville location. Background. A mammogram is an x-ray of the breast. A screening mammography is one of several tools that are used for early detection of breast cancer in asymptomatic women.