Search PubMed⌕ Search

Biomedical subjects

H L Baker

Publications and source records attributed to H L Baker.

16 recordsLinked to original sources
PubMed1979

Neurologic computed tomography in a defined population group.

A total of 766 residents of Olmsted County, Minnesota, underwent neurologic computed tomography (CT) from June 1973 through 1976; 981 scans were performed. The number of CT scans per 1,000 population increased each year and, during the period studied, the average rate based on the initial scan in each case was 2.4 and the rate based on all scans was 3.1. The age-specific rates were greatest among patients 65 years old or older. If CT use plateaus at about 6 scans per 1,000 population, then under conditions similar to those in this community, a population of approximately 400,000 would be required to assure adequate use of a CT scanner for investigating neurologic disease.

Adolescent↗
PubMed1978

Pineal tumors. A 53-year experience.

Thirty-four patients with pathologically confirmed primary pineal tumors were evaluated at the Mayo Clinic from 1923 through 1976. All tumors were of germ cell or pineal cell origin. Most patients were adolescent boys with subacute increased intracranial pressure and Parinaud's syndrome. Hypothalamic symptoms were surprisingly infrequent. Direct surgical intervention was associated with high mortality, but has been more successful in recent years.

Adolescent↗
PubMed1978

Computed tomography and radionuclide imaging in the evaluation of ischemic stroke.

One hundred forty-one patients with cerebral or cerebellar infarction were examined by computed tomography (CT) as soon after the ictus as possible. The examination was repeated in 7 days, and a radionuclide brain scan was performed. The overall detection rate for ischemic infarction was approximately equal for both techniques, ranging from 58% for radionuclide scanning to 66% for the delayed CT. Almost half of the supratentorial infarcts examined by CT on the day of the ictus were demonstrated. Mass effect was observed as early as the first day and as late as the 25th day.

Adolescent↗
PubMed1976

Performance evaluation and quality assurance of computed tomography scanners, with illustrations from the EMI, ACTA, and Delta scanners.

Performance evaluation of equipment for computed tomography (CT) involves the integration of: (a) establishing performance criteria; (b) designing and implementing test procedures; and (c) reconciling test results in terms of desired performance. Precision (noise), contrast scale, linearity, accuracy, spatial independence, spatial resolution, artifacts, reproducible performance, and patient exposure are several parameters discussed, as are problems of measurement with regard to non-water bath scanners. Performance and quality control tests for the ACTA, Delta, and EMI scanners are outlined. Guidance for the prospective purchaser of CT equipment is presented as a summary of the ideas discussed.

Computers↗
PubMed1976

Computed tomograpy and neuroradiology: a fortunate primary union.

Computed tomography (CT) has led to extensive reassessment of and alterations in the practices of neuroscientists. Many of these alterations and their implications are described. The progress and problems encountered in the past 36 months are reported as well as the trends of future investigations. The principles evolving should apply in many situations as the benefits of CT are extended to other portions of the body.

Computers↗
PubMed1976

Routine tomography of the temporomandibular joint.

Routine lateral tomography of the temporomandibular joint has resulted in a three-fold increase in the detection of positive findings. The technique is easily accomplished, eliminates the problem of superimposition of unwanted structures, permits a true lateral view of the condyle and condylar fossa, and allows small articular surface abnormalities to be identified. Although the entrance skin dose to the patient's face in the beam is about two times greater per exposure than that for our previous conventional open and closed lateral views, we believe that the increased dose is reasonable and the resulting improved diagnostic accuracy outweighs this disadvantage.

Adult↗
PubMed1976

Progressing stroke. Angiographic aspects.

Progressing strokes were noted in 17 of 256 patients who underwent surgery for atheromatous disease involving the internal carotid artery. This disorder was characterized by an active increase in the neurologic deficit during an 18- to 24-hour period. Although angiographic findings were neither specific for this type of cerebrovascular disease nor uniformly present, the angiography did indicate that not only embolization of the cerebral leptomeningeal conducting vessels but also collaterization through them was a pertinent mechanism.

Aged↗
PubMed1975

Early experience with the EMI scanner for study of the brain.

Computed tomography of the head is highly accurate new radiologic technique for the evaluation of neurologic disease. Analysis of early cases indicates that the appearance produced by CT in some conditions is unique and that increasing experience allows the neuroradiologist to predict the position and nature of disease processes with greater accuracy.

Astrocytoma↗
PubMed1975

The impact of computed tomography on neuroradiologic practice.

To assess the impact of computed tomography (CT) of the head on neuroradiologic and diagnostic practice, we analyzed its capabilities, performance, and usage in our practice during the past 18 months. The results were compared to similar data on other neurodiagnostic tests, i.e., electroencephalography (EEG), A-mode echoencephalography, cerebral angiography, cerebral pneumography, and nuclide brain scanning. All diagnostic techniques except EEG were used less often as the capabilities of CT became known to our clinicians.

Brain↗
PubMed1975

Assessment of roentgenographic lucencies of the skull: a systematic approach.

A review of roentgenologic characteristics of cranial vault defects suggests these criteria as favoring benign etiology: solitariness and small size, parasagittal location, smooth edges, sclerosis of margin, peripheral vascularity, and presence of bone remnants within the lesion. The more of these criteria that are present, the greater is the likelihood of benignity. Conversely, the presence of multiple defects of large size or scores of defects of small size, ragged undermined edges, total bone penetration, lack of peripheral vascularity, of absence of marginal sclerosis is presuptive evidence of malignancy.

Bone Cysts↗
PubMed1975

Evaluation of intracranial disorders in children by computerized transaxial tomography: a preliminary report.

Computerized transaxial tomography (CTT) is a nonivasive roentgenologic method that demonstrates the configuration of the intracranial contents, including the cerebral parenchyma and the ventricular system. Of 207 children examined by CTT, 53 later had neuroradiologic contrast studies or neurosurgical intervention, or both, and two came to autopsy. The neuroradiologic, surgical, and pathologic findings corresponded with the CTT findings in patients with large ventricles, dupratentorial tumors, intracranial hematomas or cysts, and epidural collections. The correlation was less concordant in patients with intracranial vascular malformations or lesions involving cranial bones. CTT promises to be valuable for diagnosis of many intracranial lesions in children.

Adolescent↗