Search PubMed⌕ Search

Biomedical subjects

H Hart

Publications and source records attributed to H Hart.

79 records · Page 5Linked to original sources
PubMedDate not supplied

Health and behaviour in preschool children.

This study reviews the relationship between the health and behaviour of 870 preschool children reviewed over a 5-year period. Detailed information was collected at regular intervals on rates of upper and lower respiratory tract infections, ear infections, and other illnesses. The children were examined, and their behaviour was assessed using questionnaires. In addition, the mothers of the children were interviewed, and assessment was made of levels of maternal stress. Relationships are demonstrated between episodes of illness and different behaviour problems. Night waking, poor appetite, temper tantrums, difficulty in management, and the doctor's and mother's overall assessment of behaviour were all found to be correlated with recurrent minor illnesses. Relationships were also found between maternal stress and some of the behaviour variables. Attention is drawn to the well known association of stress with physical illness, and the importance of this relationship in the management of both infections and behaviour problems in the young child is discussed.

Anorexia↗
PubMedDate not supplied

Source continuity and boundary discontinuity considerations in Bayesian image processing.

This paper extends the Bayesian image processing (BIP) formalism by considering the effect of simple source continuity and boundary discontinuity and a priori information in estimating an optimal source distribution from observed data. The a priori source information is formulated in terms of probability density functions of source element strengths and spatial correlations. The estimation is carried out iteratively by a BIP algorithm derived by applying the expectation maximization technique to the a priori source probability density functions and assuming the data obey Poisson statistics. The suppression of boundary oscillations and enhancement of overall image are demonstrated for computer generated ideal and Poisson randomized data.

Algorithms↗
PubMedDate not supplied

[Digital sialography].

Sialography is at present performed either by the subtraction mode or conventional technique only. We utilised a high-resolution digital radiography system with a 1024 x 1024 matrix in 17 patients with diseases of the salivary glands. Digital subtraction ductography in lateral projection was followed by digital radiography in adequate projections. In that way advantages of both methods could be combined in one. Additional advantages are possibilities of storage and communication of the digital data.

Adult↗
PubMedDate not supplied

MR imaging of the optic nerve and sheath: correcting the chemical shift misregistration effect.

The interface between soft-tissue structures and adipose tissue may be obscured by the chemical shift misregistration effect on MR images. In the orbit, this effect occurs at the edges at the optic nerve, even on high-resolution local coil images. In both phantom and clinical studies with a 1.5 T local coil imaging system, it was found that the chemical shift misregistration effect can be minimized by positioning the patient so that the optic nerve is parallel to the frequency encoding gradient. Alternatively, the effect can be corrected by using a computer program to combine "lipid" and "water" proton images. The sensitivity of MR for optic nerve lesions should be improved by these technical modifications.

Child↗
PubMedDate not supplied

Magnetic resonance imaging of the jugular foramen.

The jugular foramen in normal volunteers was studied with 1.5 T magnetic resonance (MR) systems in 3-mm-thick head- and surface-coil images. Anatomic sections through cadaver heads were correlated with the MR images to identify the jugular bulb and the course of cranial nerves IX-XI. Sagittal images were more useful than coronal or axial to show the course of these nerves through the skull base. MR demonstrates the anatomic relations of the jugular foramen (except its osseous margins) such that its primary use in evaluating this region can be anticipated.

Accessory Nerve↗
PubMedDate not supplied

Comparison of tests for the lupus anticoagulant and antiphospholipid antibodies in systemic lupus erythematosus.

A variety of laboratory assays are used to screen for the presence of the lupus anticoagulant. Six commonly used coagulation tests, and the ELISA assay for antiphospholipid antibody using three different substrate phospholipids, have been evaluated in 110 patients with systemic lupus erythematosus or lupus-like disease. One or more coagulation assays was abnormal in 41% (45/110) of the patients. No individual test detected more than 78% of these abnormalities, indicating that a single phospholipid based coagulation test cannot be used to screen for a possible lupus anticoagulant. A combination of Actin FSL, DTTA and DRVVT detected all the abnormalities. The most sensitive two-test combination was Actin FSL and DRVVT. Approximately half (56%) of the patients with a positive clotting test had an abnormal antiphospholipid antibody assay. A similar proportion (58%) of the aPL positive patients had a prolonged coagulation test. The marked discordance between the coagulation assays and a positive antiphospholipid antibody test further complicates the laboratory definition of this abnormality, at least in patients with systemic lupus erythematosus.

Adolescent↗