Gray scale echography with simultaneous a mode presentation a new apparatus for high resolution ultrasonograms
A diagnostic ultrasonic system has been developed for simultaneous display of quantitative A mode and gray scale B mode presentations. An independent calibrator and preset amplification levels allow the apparatus to be calibrated for precise, repeatable examinations. A wide range of echo amplitude information is available to the clinician by the use of selective logarithmic signal compression. Distance measurements in the eye and the orbit are made to 0.1 mm precision and are displayed numerically on the control panel. The newer signal processing techniques provide high‐resolution imaging of ophthalmic structures over a wide system bandwidth. Sensitivity has been improved to image structures heretofore not observable with ultrasonic instruments. This technique is the basis for recently initiated clinical studies.
Color coding of B-scan ultrasonograms.
The use of color coding accentuates amplitude variations in the "gray scale" of B-scan ultrasonography. Color coding by means of selected "sliced" amplitudes uses red for high amplitude echoes, green for moderate amplitude echoes, and blue for low amplitude echoes in order to accentuate spatial relationships of echoes within tumors, foreign bodies within hemorrhage or tissue, and membrane or retina within vitreous hemorrhage. Color coding systems allow for easier detection of variations in echo amplitudes and the display of these echoes over a larger portion of their dynamic range, features that are essential for ultrasonic diagnosis of tissue abnormalities.
Spin label motion in fatty acids.
Spin labels dissolved in highly purified fatty acid systems exhibit nearly identical tumbling rates in liquid and solid phases. Even though the spin labels do not have the same molecular geometry as the lipid matrix the melting point of the matrix can be inferred by measurements of the temperature dependency of molecular motion.