[en] A method of measuring relative blood flow through at least a part of the body using penetrating radiation comprises transmitting a plurality of rays at an initial angle or initial mean angle through a planar slice of the body to define a first set of rays, transmitting a plurality of further sets of rays at angles or mean angles different from each other and from the initial angle or initial mean angle through the same planar slice of the body to define by the intersection of all such rays a two-dimensional matrix of elements of the body in the slice, measuring for each ray emerging from the body a number of over the period of time at least equal to a pulse interval representing the momentary sum of the transmissions or absorptions of the element of the body intersected by the ray, determining from the momentary signals momentary signals a difference signal representing the maximum difference between the momentary signals for each ray over the period of time, deriving sets of discrete difference signals corresponding to the sets of rays, the difference signals being indicative of the transmission or absorption of blood flowing through each element of the body in the matrix, and calculating from the difference signals resultant signals representing the transmissions or absorptions due to blood flow in the elements of the matrix. These resultant signals may be visually depicted on a cathode ray tube display, as a digital print-out, or as a photograph. 30 claims, 8 figures

[en] This book is written to assist the operator when performing an organized and directed ultrasound examination. It provides, in outline form, a sequential approach to the scanning of abdominal organs and regions by; indicating the structures within the organ or region that should be scanned; suggesting other regions for examination if abnormalities within the initially imaged structures are detected and; suggesting differential diagnostic possibilities when abnormalities are seen

[en] A number of image-processing techniques have been applied to a digital ionographic chest image in order to evaluate their possible effects on this type of image. In order to quantify any effect, a simulated lesion was superimposed on the image at a variety of locations representing different types of structural detail. Visualization of these lesions was evaluated by a number of observers both pre- and post-processing operations. The operations employed included grey-scale transformations, histogram operations, edge-enhancement and smoothing functions. The resulting effects of these operations on the visualization of the simulated lesions are discussed. (author)

[en] Abstract only45

[en] This book contains 13 chapters. The first two chapters include a review of the principles of CT image formation and quality and provide coverage of normal cross-sectional anatomy of the chest, abdomen, and pelvis. Ten chapters cover the major disease processes of these anatomic regions. The last chapter describes CT-guided interventional techniques. Some correlation with other imaging modalities is included in the study of the mediastinum, lungs, and gastrointestinal tract

[en] To evaluate the clinical usefulness of a new screen-film system (advanced screen-film system; AD system) for chest radiography, its fundamental imaging properties were investigated. The basic imaging properties were evaluated by measuring characteristic (H and D) curves, relative speeds, MTFs (modulation transfer functions), WS (Wiener spectra), and x-ray attenuation of screens. The film gradient of the AD system was slightly lower at low radiographic density. and higher at high density. The screen speed of the AD system was 112% greater than that of the conventional system, and the film speed was 47% lower. As the result, the total speed of the AD system was slightly higher compared with the conventional system. Resolution property of the AD system was comparable to or slightly lower than that of the conventional system. However, the noise level of the AD system was considerably lower than that of the conventional system at low and middle photographic density levels. X-ray attenuation of the HG-M screens was about 10% higher than that of the conventional screens. We conclude that the AD system has superior imaging properties than the conventional system. (author)

[en] One-hundred and ten in-patients were included in a double-blind parallel randomized study of iopentol 300 mg I/ml (Nycomed AS, Oslo, Norway) vs. ioxithalamate 300 mg I/ml (Laboratoires Guerbet, Aulnay-sous-Bois, France) in abdominal CT. The contrast medium was administrated as a bolus of 50 ml. Significantly more patients in the ioxithalamate groups experienced discomfort in the form of heat, chill or pain associated with the injection (p=0.001). No serious adverse event occurred. The contast media appeared equal regarding radiographic efficacy. Both contrast media appeared to be safe and effective for use in adult abdominal CT, and iopentol to be somewhat better tolerated. (author). 9 refs.; 3 tabs

[en] The acute abdomen is one of the most frequent, most dangerous and most difficult problems that the diagnostic radiologist has to deal with. This comprehensive manual presents a clinico-radiologic approach to the use of diagnostic imaging techniques for acute abdominal conditions. Imaging techniques, radiologic symptoms and clinical conditions are treated separately. This format, together with a detailed subject index, offer the reader a quick and reliable reference aid in daily practice

[en] When computed tomographic (CT) digital radiography is used for pelvimetry, measurement error may occur. Geometric distortion in the lateral direction of the CT digital radiograph can lead to an error in any measurement of the transverse pelvic inlet. The authors measured the magnitude of this error on two scanners and present a general method for correction of this potential error. The authors also showed that an additional dose reduction is possible if the patient is imaged in the posteroanterior rather than anteroposterior projection

No abstract available