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J Sebes

Publications and source records attributed to J Sebes.

10 recordsLinked to original sources

A variable resolution x-ray detector for computed tomography: II. Imaging theory and performance.

A computed tomography (CT) imaging technique called variable resolution x-ray (VRX) detection provides variable image resolution ranging from that of clinical body scanning (1 cy/mm) to that of microscopy (100 cy/mm). In this paper, an experimental VRX CT scanner based on a rotating subject table and an angulated storage phosphor screen detector is described and tested. The measured projection resolution of the scanner is > or = 20 lp/mm. Using this scanner, 4.8-s CT scans are made of specimens of human extremities and of in vivo hamsters. In addition, the system's projected spatial resolution is calculated to exceed 100 cy/mm for a future on-line CT scanner incorporating smaller focal spots (0.1 mm) than those currently used and a 1008-channel VRX detector with 0.6-mm cell spacing.

Algorithms↗

Spindle cell hemangioendothelioma. Report of three cases and review of the literature.

BACKGROUND: Spindle cell hemangioendothelioma lesions are uncommon, affect a wide age range in both sexes, and show a predilection for skin and subcutaneous tissue of the extremities. OBJECTIVE: To present three cases of spindle cell hemangioendothelioma and review the literature. METHODS: Three cases of spindle cell hemangioendothelioma are presented. RESULTS: Two of our cases first presented very early in life and progressed by local recurrences over many years. None of our cases showed evidence of metastases, but the lesions exhibited local aggressive and invasive behavior. Histologically, the lesions consist of alternating areas of dilated, thin walled cavernous vascular spaces and solid areas composed predominantly of spindle cells and clusters of epithelioid endothelial cells with intracytoplasmic vacuoles. That spindle cell hemangioendothelioma is a non-neoplastic lesion and not a neoplasm of borderline malignancy is suggested by the following observations from our cases: the repeated presence of organized intravascular thrombi in all cases, the early clinical presentation in two cases, and the presence of some degree of vascular malformation at the periphery of lesions. CONCLUSION: Both clinicians and pathologists should be aware of the existence of this lesion in order to diagnose and treat an affected patient correctly.

Adult↗

Intraosseous fat necrosis and infarction associated with pancreatitis.

A case of trauma-induced pancreatitis with subsequent intraosseous fat necrosis and infarction is presented. The young patient demonstrated multiple cortical lytic lesions of the lower extremities and bilateral sterile joint effusions. Several radiographic modalities were employed in the workup of his disease. Related findings and pathophysiologic considerations are reviewed.

Adult↗

Families at risk for destructive parent-child relations in adolescence.

This paper examines the parental, adolescent, and family system characteristics that place a family at risk for destructive parent-child relations in adolescence. It is based on a study of 62 families, all of which contained a youth (age 10-16) and 2 parents and were referred because of the adjustment problems of the adolescent. A 3-member team visited the family at home to administer a 3 1/2-hour battery of questionnaire, interview, and observation instruments. These included a measure of risk for destructive parent-child relations (the Adolescent-Abuse Inventory); the Achenbach Child Behavior Checklist; a measure of the family as an interactional system (FACES); the Cornell Parent Behavior Description; and assessments of adolescent physical maturation, interparental conflict, cognitive functioning, life events (A-FILE), and demographic and socioeconomic factors. The results permit identification of families as high risk for destructive parent-child relations using the parental scores on the Adolescent-Abuse Inventory. The high-risk group tends to be "chaotic" and "enmeshed" (FACES), to include more stepparents, to be more punishing and less supportive (Cornell Parent Behavior Description), and to be more stressed by life changes (A-FILE). Adolescents in the high-risk families are characterized by significantly more developmental problems (both internalizing and externalizing), and the number of such problems correlates significantly with the risk for destructive parent-child relations. The development of adolescent psychopathology appears to interact with the evolution of a high-risk family system to produce destructive relationships between parents and their adolescent offspring. Stepfamilies appear especially vulnerable to this dysfunctional evolution.

Adjustment Disorders↗

Radiographic evaluation of treatment of advanced carcinoma of the prostate.

Radiographic evaluation of 65 patients with disseminated carcinoma of the prostate shows that 8% demonstrated resolution of metastatic deposits after palliative transurethral resection and/or estrogen or castration therapy. The increased effectiveness of therapy and the improved management of patients are reflected in longer survival. Roentgenographic evidence of increasing sclerosis of osteoblastic metastases of carcinoma of the prostate indicates that the rate of bone repair exceeds the rate of bone destruction, and is not necessarily an indication of progression of the disease. Increasing prominence of blastic bony lesions is not a poor prognostic sign; several patients showing it were symptom-free and survived for long periods. Sclerotization of lytic deposits is definitely a good prognostic sign of treatment and represents "healing change" within involved bone.

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