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Biomedical subjects

E J Potchen

Publications and source records attributed to E J Potchen.

116 records · Page 7Linked to original sources
PubMedDate not supplied

An algorithmic approach to the roentgenographic evaluation of head trauma: medical and financial implications.

An algorithm was devised for the evaluation of patients with acute head trauma. The effectiveness of this strategy was tested with a retrospective chart review of 608 patients seen in a community hospital emergency room. The results of the algorithmic approach were compared to the original management of the patients. A financial savings of 65% was achieved and no significant intracranial pathology was missed using this approach.

Brain Injuries↗
PubMedDate not supplied

Demonstration of an early draining vein by MR angiography.

We present a case of an arteriovenous malformation (AVM) where standard MR angiography demonstrated an enlarged basal vein of Rosenthal. The lenticulostriate branches of the middle cerebral artery were suggested but not conclusively shown, as the feeders of the AVM. Therefore, it could not be determined whether the enlarged vein was part of an AVM or of a venous angioma. By using a saturation pulse inferior to the image volume including the basal vein of Rosenthal and the middle cerebral artery, the transmission of "black blood" to the basal vein of Rosenthal was demonstrated. This implied early venous draining, which confirmed that the lesion represented an AVM.

Adult↗
PubMedDate not supplied

Medical-legal issues in radiology: prevention and control.

Concerns about legal implications affect many decisions of the average radiologist, and physicians do not always appreciate the validity of these concerns. However, such concerns often influence radiologists' decisions more than is warranted. An improved understanding of the law and its ramifications may serve to prevent adverse legal effects found in the everyday practice of radiology. Legal issues influence radiology in many ways. Two important ways the law affects the practice of radiology relate to the business affairs of radiologists and to the radiologist's duty to perform to a standard of care. Legal issues relate to the business aspects of radiology through radiologists' relationship to their group practice and the radiology group's relation to the outside world. Radiology groups use legal services for issues such as employment contracts, hospital privileges, group relations, and bylaws. They make decisions with major legal implications when they establish their standard business practices. These decisions range from business procedures that ensure a timely delivery of service to the choice and implementation of quality assurance systems to how to ensure that patients are informed of the results of a radiologic examination. Legal matters affect many business decisions radiology groups make. Antitrust law is concerned about issues such as cost sharing, price sharing, mergers, acquisitions, and practice patterns. Laws limit the right to practice radiology. Billing practices, conflicts of interest, self-referral, right to refuse care, employment practices--all have substantial legal implications. These issues are a concern of every practicing radiologist. Changes in our health care system may cause new legal obligations. An appreciation of the relationship radiologists must have with payors and patients is increasingly important in preventing medical-legal problems. These additional duties and responsibilities occur when many physicians and the public at large seem to feel they are already overburdened with legal duties and responsibilities. A lack of familiarity with the legitimate relationship of the law to everyday life may greatly affect radiologists' job satisfaction. Many acts physicians perform in the practice of radiology have legal implications not often recognized by the practicing radiologist. This monograph seeks to enhance radiologists' understanding of some common and important legal issues related to their practice of medicine. We hope that this monograph will help radiologists appreciate the legal implications of their behavior. The opinions expressed in this monograph are those of the authors and should not be inferred to represent the official views of any government agency.(ABSTRACT TRUNCATED AT 400 WORDS)

Adult↗
PubMedDate not supplied

Rapid MR imaging of the liver: comparison of twelve techniques for single breath-hold whole volume acquisition.

Twelve magnetic resonance imaging pulse sequences for single breath-hold whole volume acquisition of the liver were evaluated on volunteers. Liver and spleen contrast to noise ratio (C/N), overall image quality, and grade of artifacts were compared. The 12 sequences included T2-weighted fast spin echo (FSE) with or without fat suppression (FS), fast multiplanar spoiled gradient recalled imaging (FMPSPGR), fast gradient recalled imaging without preparation pulses (FGR), FGR with inversion recovery preparation pulse nulling the liver or fat (IR-FGR-L and IR-FGR-F), FGR with driven equilibrium preparation pulse (DE-FGR), single shot moderately or heavily T2-weighted spin echo echo planar imaging (SE-EPI-mT2 and SE-EPI-hT2), multi-shot moderately T2-weighted spin echo echo planar imaging (multi-shot SE-EPI-mT2), inversion recovery EPI, and gradient echo EPI. In the quantitative analysis, FSE + FS showed a significantly higher C/N ratio than the others (p < 0.05). In the qualitative evaluation, DE-prepFGR, and single and multi-shot SE-EPI-mT2 had good results, as did FSE and FSE + FS. Further studies should be conducted to determine whether or not these breath-hold sequences can obviate current conventional non-breath-hold sequences.

Adipose Tissue↗
PubMedDate not supplied

Flow velocity and volume measurement of superior and inferior mesenteric artery with cine phase contrast magnetic resonance imaging.

The flow velocity and volume of the superior and inferior mesenteric arteries (SMA, IMA) were measured with cine phase contrast magnetic resonance (MR) imaging in five healthy volunteers. Each volunteer was first measured in a fasting state, and then one, two, and three hours after a meal. The average SMA flow volume of the volunteers was 230.3 +/- 46.8 ml/min (mean +/- standard error) during the fasting state, and 714.7 +/- 207.7 ml/min, 339.2 +/- 85.7 ml/min, and 263.8 +/- 21.0 ml/min, respectively, at one, two, and three hours postmeal. The increase at one hour postmeal was statistically significant (p < 0.05). The corresponding flow measurements in the IMA were 63.1 +/- 11.2 ml/min, 67.6 +/- 11.2 ml/min, 57.9 +/- 8.6 ml/min, and 53.2 +/- 6.8 ml/min. These values do not represent a statistically significant flow volume change in the IMA. In all volunteers, the SMA volumetric flow increased the most one hour after the food challenge (72-400% relative to baseline). Diastolic velocity in the SMA increased significantly one hour postmeal, but systolic velocity did not change significantly. The IMA did not demonstrate a significant change in either systolic or diastolic velocity. The difference between the SMA and IMA in the way of reacting against the food challenge is thought to represent the difference between the requirements of small and large intestine for blood supply after the food challenge. These data demonstrate the possibility of this modality for the assessment of conditions such as chronic mesenteric ischemia.

Adult↗