Room temperature electrical detection of spin coherence in C60.

An experimental demonstration of electrical detection of coherent spin motion of weakly coupled, localized electron spins in thin fullerene C60 films at room temperature is presented. Pulsed electrically detected magnetic resonance experiments on vertical photocurrents through Al/C(60)/ZnO samples showed that an electron spin Rabi oscillation is reflected by transient current changes. The nature of possible microscopic mechanisms responsible for this spin to charge conversion as well as its implications for the readout of endohedral fullerene (N@C(60)) spin qubits are discussed.

Adrenal cortex dysfunction: CT findings.

The computed tomographic appearance of the adrenal gland was studied in 302 patients with possible endocrinologic disease and 107 patients undergoing CT for nonendocrinologic reasons. Measurements of adrenal size were also made in 100 adults with no known adrenal pathology. CT proved to be a sensitive diagnostic tool in combination with clinical studies. When blood hormone levels are increased, CT can differentiate among homogeneous organic hyperplasia, nodular hyperplasia, benign adenoma, and malignant cortical adenoma. When blood hormone levels are decreased, CT can demonstrate hypoplasia or metastatic tumorous destruction. Calcifications or caseations can be demonstrated earlier than on plain radiographs. When hormone elimination is increased, the morphologic substrate can be identified; tumorous changes can be localized and infiltration of surrounding organs recognized.

Computed tomography of cystic ovarian teratomas with gravity-dependent layering.

Computed tomography (CT) may serve as a valuable adjunct in cases of ovarian dermoid cysts which present diagnostic difficulties on radiographic and ultrasound examination. The heterogeneous composition of cystic teratomas includes calcifications or an osseous component, a solid component of soft tissue density, a fluid component of water density, and a fourth component with negative attenuation values typical of high-fat content. The CT finding of a gravity-dependent layering within a fatty mass or a fat-fluid level is pathognomonic of dermoid cysts.

Scanned projection radiography of the chest versus standard film radiography: a comparison of 250 cases.

Two hundred fifty patients who had 240 pathological changes of the lungs or mediastinum were examined using both scanned projection radiography (SPR) and standard film radiography, and the diagnostic accuracy of the procedures was compared. The use of standard film radiography led to diagnostic findings in 90.1% of the cases, while 94% of the images obtained at SPR provided diagnostic findings. The equivalent performance and, in part, the slight superiority obtained with the digital technique is a result of the better contrast resolution for objects with diameters greater than 2 mm. A further improvement in the diagnosis of thoracic disease with digital radiography may occur because of the use of special mathematical algorithms for image reconstruction and with the use of dual-energy subtraction radiography rather than by an increase of spatial resolution.