(KudoZ) English to French translation of SLOT SCANNING: radiographie à fente, à faisceau en fente [Tech/Engineering]. Comparison of slot scanning digital mammography system with full-field digital mammography system. Lai CJ(1), Shaw CC, Geiser W, Chen L. AJR, July W Upright Biplanar Slot Scanning and the pelvis, with satisfactory image quality. The acquisition time of 12 seconds was noted.
Comparison of slot scanning digital mammography system with full-field digital mammography system.
The CR method yielded two image sets standing anteroposterior radiography of the lower extremities [SAPL] and scanogram of the lower extremities [SL] of the lower extremities. Some important advantages of the SSDR method include the limited number of detector elements, high spatial resolution, and the lack of a scatter grid 2. The entire ROI is imaged in one exposure; hence, these systems are also referred to as full-field radiography systems. In the case of a fan beam, such as the Lodox system, the intensity decreases in direct proportion to the distance from the source, i. The lower extremities were positioned with both patellae pointing toward the ceiling and a radiopaque ruler taped on the table between both legs.
Improving safety of x-ray exams using slot-scanning x-ray systems
The Science The Lodox system utilises a unique geometry, detector configuration and Linear Slot Scanning Radiography LSSR technology to achieve exceptionally high quality images with very low radiation dose.
More Technical reference papers can be accessed on the tab below. Linear Slot Scanning Radiography Linear slot-scanning radiography LSSR is the method of taking X-ray images whereby the X-ray source and detector move across the patient, or region of interest, during image acquisition. This contrasts with conventional or digital radiography systems, where a static source and detector are used, with a limited maximum field of view.
Fan beam versus Cone beam Geometry In a conventional X-ray system, the X-ray beam emitted from the source has a conical shape, i. The beam can be collimated to cover only the region of interest ROI. The entire ROI is imaged in one exposure; hence, these systems are also referred to as full-field radiography systems. In LSSR the beam is shaped as it exits the source by passing it through a very narrow slot. The resulting beam has a fan shape which spreads out only across the width of the detector, but is narrow in the scan direction.
A further, tungsten collimator is used to trim the beam further in the scan direction. Typically, the thickness of the fan beam in the scan direction is about 6 mm when it reaches the detector. This has the effect of limiting the number of secondary, poorer quality, photons that form the X-ray beam.
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Published online Feb 5. Address reprint requests to: Abstract Objective To compare the slot-scan digital radiography SSDR of the lower extremity region and the computed radiography CR method with respect to the image quality and radiation exposure. The study evaluated and statistically compared the image quality of four features outer cortex, inner cortex, trabeculae and intermuscular fat at six different levels pelvis, hip, femur, knee, tibia and ankle between each method.
The image quality was evaluated using a visibility scale, and the entrance skin dose was measured using a dosimeter at three different levels of a phantom hip, knee, and ankle.
Conclusion Both the image quality and patient entrance skin dose data suggest that the SSDR method is superior to the CR method for the lower extremity musculoskeletal examination. Computed radiography, Slot-scan digital radiography, Lower extremities, Phantom Following the introduction of low-dose digital radiography at the Budker Institute of Nuclear Physics in the beginning of the s, the demand for and the use of digital image acquisition, display, and archiving systems has greatly increased in the field of radiology.
Recently, the slot-scan digital radiography SSDR method has been introduced for chest and breast imaging as a new scanning technology of digital radiography. The system uses slot scanning geometry to acquire the radiography without the use of an anti-scatter grid.
The narrow fan-like beam is synchronized with the detector when scanning a patient. As a result, the image data are obtained from the detector as the patient is scanned via the time consuming method 1. Some important advantages of the SSDR method include the limited number of detector elements, high spatial resolution, and the lack of a scatter grid 2.
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