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K F Neufang

Publications and source records attributed to K F Neufang.

At least 73 records · Page 4Linked to original sources
PubMed1984

[Image quality in intravenous digital subtraction angiography of renal vessels].

Visualisation of the renal arteries and image quality of intravenous DSA were evaluated in 62 patients. The left renal artery is visualised less well than overlying more frequently the right renal artery because of gas in the stomach and colon. IV DSA is not adequate for visualisation of the subsegmental arteries, and cannot be used for tumor angiography. It is not possible to prove that central venous injection technique is superior to peripheral venous injection. Patients must be carefully prepared as is necessary for the urogram. Examination is carried out using Buscopan and a compression device.

Adult↗
PubMed1983

[Indications for intra-arterial digital subtraction angiography (DSA) in vascular disease].

Digital subtraction angiography (DSA), using a direct arterial route, diminishes the risk of the examination by reducing the contrast dose by about 75%, making the examination more rapid and making it less likely that catheters will have to be changed. At the same time superimposition is avoided, one of the advantages of selective catheterisation. In view of the low contrast dose, it is possible to carry out several examinations at one time and to use additional projections for intracranial and peripheral disease, thereby improving the diagnostic value of the examination. For certain problems, intra-arterial DSA is already able to replace conventional angiography. The small field size and poor spatial resolution still make conventional angiography necessary as the basic form of investigation in most other circumstances.

Angiography↗
PubMed1983

[Radiation exposure during digital subtraction angiography (DSA) of the kidney and aortic arch].

The somatic and genetic radiation dose from DSA and conventional film angiography were compared, using an Anderson-Rando phantom. The dose is greatly influenced by the method of examination; for the examination of the aortic arch in a male, DSA reduces it by a factor of 4 as compared with conventional angiography, in a female by a factor of 11. For renal DSA (PA) somatic dose for a man is 25 times greater, and for a woman 18 times greater, than with conventional angiography (AP). Renal DSA should therefore be carried out in an AP projection in order to reduce the bone marrow dose in the lumbar spine.

Angiography↗
PubMed1983

[Non-invasive diagnosis of carotid artery-cavernous sinus fistulas using computed tomography].

Typical CT-findings of carotid-cavernous sinus fistulas are asymmetric enlargement and bulging of the lateral contours of the cavernous sinus and dilatation of draining orbital and facial veins. They can be best demonstrated with thin-section scans and rapid intravenous bolus injection of contrast agent. Among the differential diagnoses, a variety of orbital, intrasellar and parasellar lesions must be considered. For definitive radiologic diagnosis cerebral angiography continues to be required.

Adult↗
PubMed1983

[Sonography of the superior mesenteric artery. Normal anatomy variations and value for the analysis of retroperitoneal space occupying processes].

The superior mesenteric artery (SMA) can be demonstrated by ultrasonography under adequate conditions as a tubular liquid structure of 3 to 7 mms. in diameter, which parallels the abdominal aorta at a distance of 2 to 5 mms. The aortomesenteric distance is higher in patients with arteriosclerosis or aneurysm of the abdominal aorta, enlarged pre-aortic lymph nodes or other retroperitoneal masses. Its measurement can be recommended for quantitative assessment of retroperitoneal lymphadenopathy. Anatomic variations and postoperative changes may alter the course of the SMA. Measurement of the aortomesenteric angle is of no practical value.

Adult↗
PubMed1983

Conventional roentgen diagnosis of mediastinal lymphadenopathy. Review article (Part two).

Although CT has significantly improved the imaging of space occupying mediastinal processes, it cannot be the first diagnostic step for reasons of cost, radiation exposure and capacity. Therefore, the conventional chest examination with biplane films, film tomography and esophagogram continues to be the basic roentgen procedure. The basis of the conventional studies is the analysis of the pleuro-mediastinal borders. This paper describes the roentgen-morphological aspects of enlarged lymph nodes in the mediastinal compartments as far as they can be detected with conventional studies. The differential diagnoses are discussed and recognition of early and discrete lesions is particularly emphasized.

Aorta, Thoracic↗
PubMed1983

[Conventional diagnosis of lymphadenopathies--value of conventional roentgen examination and supplementation of other imaging technics].

The introduction of new imaging modalities, such as computed tomography and sonography, has not lessened the importance of conventional roentgen examinations of the chest as routine and screening procedures for detecting mediastinal lymph node disease. Precise understanding of the normal and pathologic anatomy of the mediastinum in conventional films is required for an early and adequate use of computed tomography and eventually abdominal ultrasonography as additional examinations. Only by this the involvement of mediastinal nodes by malignant lymphomas or metastases can be detected, proved and treated early. Chest films still are of greatest value for follow-up studies in both evident and suspected malignant thoracic lymph node disease.

Diagnosis, Differential↗
PubMed1983

[Procedure for shunt imaging in dialysis patients with special reference to digital subtraction angiography].

All angiographic procedures established for imaging of hemodialysis fistulas, such as direct venous angiography, intravenous subtraction angiography and arteriography by direct puncture of the brachial artery or by Seldinger's transfemoral technique, can also be effected with digital image processing. Depending on the angiographic technique, the use of digital subtraction angiography has several advantages: lower doses and concentrations of the contrast agent, lower risk of complications (thrombosis of the fistula, vasospasm) and freedom from pain. In addition, there is a marked reduction of examination time and film cost.

Angiography↗
PubMed1982

[First clinical experiences with a new large frame intensifier in thoracic diagnosis].

In 350 patients with 870 pathologic findings comparative blind analysis of conventional chest films and biplane 100 mm photofluorographic images taken with the large-field image intensifier revealed high accuracy in the evaluation of coin lesions, hilar and pleural pathology, pulmonary vasculature and the right paratracheal stripe. Moderate central interstitial edema, more subtle interstitial changes particularly in the lung periphery including Kerley's B-lines, and calcifications in the hilum or the aortic arch are not visible in all cases for the evaluation of lesions of the ribs special films continue to be mandatory. Lateral views are of good quality. The spatial resolution of the large-field image intensifier was measured to be 4.5-5.2 LP/mm at the output phosphor, the spatial resolution of the 100 mm intensified images ranges from 2.6-3.8 LP/mm in the center. Mean skin dose was found to be 6.3 mrd in the p.a. projection which is less than 5% of the values registered in non-intensified photofluorography and even by factor 5 lower than in conventional chest x-ray using rare earth screens.

Adult↗
PubMed1982

[Diagnostic value of the conventional chest X-ray for the assessment of the hemodynamics after combined aortic and mitral valve replacement].

Conventional roentgenograms of 25 patients who underwent combined aortic and mitral valve replacement were evaluated and correlated with pre- and postoperative functional and haemodynamic parameters. The roentgenograms were obtained 6 months before and up to 25 months after valve replacement. A reduction in heart size could be seen in nearly all patients. This was independent of clinical and haemodynamic results. An increase in heart size always suggests severe haemodynamic worsening, especially a paravalvular leakage. The most valuable x-ray sign is the degree of pulmonary congestion, which is well correlated with the cardiac index.

Adult↗
PubMed1982

Conventional roentgen diagnosis of mediastinal lymphadenopathy. Review article (part one).

Although CT has significantly improved the imaging of space occupying mediastinal processes, it cannot be the first diagnostic step for reasons of cost, capacity and radiation exposure. Therefore the conventional chest examination with biplane films, film tomography and esophagogram continues to be the basic roentgen procedure. The basis of the conventional studies is the analysis of the pleuro-mediastinal interfaces which represent the lateral mediastinal borders. This paper describes the roentgen-morphologic aspects of enlarged lymph nodes in the mediastinal compartments as far as they can be detected with conventional studies. The differential diagnoses are discussed and recognition of early and discrete lesions is particularly emphasized.

Adult↗
PubMed1982

[Catheter angiography in the aged patient: techniques and results (author's transl)].

We report on 133 suprarenal translumbar, 74 transfemoral and 1 transaxillary, together 208 catheter angiographies in patients aged over 70 years. The most frequent indication was arterial occlusive disease (74 per cent). For imaging of the abdominal aorta, the iliac and lower limb arteries and of the aortic arch we prefer the suprarenal translumbar catheter angiography in local anesthesia. Selective imaging of abdominal and supraaortic arteries is the main indication for the transfemoral catheter angiograhy. Side-effects and complications are limited to 2.4 per cent each. Puncture problems were present in this age group twice as often in the transfemoral approach (11%) than in the translumbar approach (6%). In 2 patients both angiographic methods failed.

Aged↗
PubMed1982

[The right paratracheal stripe--an aid in the evaluation of upper mediastinal disease (author's transl)].

Normal roentgen anatomy, physiologic variations and pathologic changes of both shape and size of the right paratracheal stripe (RPS) are discussed. The broad spectrum of common and rare differential diagnosis of the pathologic RPS is demonstrated. There are space occupying lesions in the middle compartment of the upper mediastinum, originating from the trachea or the paratracheal tissue including lymph nodes, mediastinal hemorrhage and infection, goiter, vessels and opacifying processes in the adjacent lung and pleura. Under these conditions the RPS may be displaced, widened, irregularly or poorly delineated or obliterated. For correct interpretation clinical findings and history are mandatory.

Hematoma↗
PubMed1981

[Frequencies of pleuro-mediastinal lines in healthy subjects. A contribution to the knowledge of the normal roentgen anatomy of the mediastinum (author's transl)].

The postero-anterior chest radio-grams of 1.000 consecutive adults with no evidence of intrathoracic diseases were evaluated and the frequencies of the common pleuro-mediastinal lines in four age groups were calculated. The following lines are less frequent in the age (percentages in the youngest group, ages 18-25, and the oldest group, ages 41-65, respectively): posterior lines in the infra-azygos area (51-19%, p less than .001), right paraspinal line (28-8%, p less than .001), left paraspinal line (11-1%, p less than .01), anterior junction line (41-21%, p less than 0.1), and posterior lines in the supraazygos area (86-66%, p less than .05). The incidences of the right paratracheal stripe (76%), of the aortic nipple (4%) and of the double-contour in the supra-aortic area (51%) were independent from age. The physiologic variations of these lines are discussed. The posterior boundaries of the lung in the supraazygos area manifest as a right pleuro-esophageal line (36%) or as a posterior junction line (64%). A small sickle-like pleuro-esophageal stripe is found in 9%.

Adolescent↗
PubMed1981

[Left atrial enlargement in mitral valve disease - a comparison of conventional roentgen signs and methods of roentgenographic measurement (author's transl)].

The different signs of left atrial enlargement on the conventional biplane chest roentgenogram and the methods of measurement are discussed and evaluated in 85 patients with mitral valve disease. The posterior displacement of the barium-filled esophagus is the most sensitive qualitative sign for left atrial enlargement. The sagittal left atrial diameter recording to Westcott and coll. can be easily measured and reproduced. It is recommended for quantitative studies of left atrial size.

Adult↗