Single Injection Of Contrast Material Research Articles

Rotatostereoradiography: A New Radiodiagnostic Method

The rotatostereoradiographic device uses an x-ray tube coupled with an image intensifier rotating through a 180 degree arc in 2.25 seconds. The rapidly rotating x-ray tube allows 180 degree-arc angiograms to be obtained with a single injection of contrast medium. Subtracted fluoroscopic angiograms can be viewed immediately after injection of the contrast medium with digital recording. These three-dimensional images are displayed on side-by-side monitors stereoscopically. The mortality and morbidity of subarachnoid hemorrhage can only be greatly reduced by surgical treatment of unruptured aneurysms and arteriovenous malformations detected by a wide survey of subarachnoid hemorrhage. Such a wide survey would be possible utilizing intra-arterial digital subtraction angiography via the ascending aorta and this new three-dimensional radiodiagnostic method. A fluoroscopic device must be used to allow easier manipulation of the catheter from the axillary or brachial artery.

The clinical efficacy of triple-injection wrist arthrography.

Triple-injection wrist arthrography has been demonstrated to increase the likelihood that all the ligamentous perforations in an injured wrist will be diagnosed. However, compared with imaging after single injection of contrast material into the radiocarpal joint, triple-injection arthrography not only increases patient expense but also significantly increases the time required of both patients and arthrographers to obtain the diagnosis. With the goal of decreasing the number of triple injections, the author reviewed 50 consecutive triple-injection wrist arthrograms. Using a technique based on high-volume injection of contrast material to achieve complete distention of the joint, the author achieved a false-negative rate for demonstration of complete perforations with radiocarpal injection alone of only 2% (10% if partial perforations were included). In none of these cases was patient treatment altered by the additional information provided by the second and third injections. This false-negative rate is significantly lower than that reported previously and raises the question of whether there are circumstances in which the easier and less time-consuming single radiocarpal injection might be appropriate.

Intravenöse digitale Subtraktionsangiographie der unteren Extremitäten kombiniert mit Schrittverschiebung (Zwei-Felder-DSA)

We evaluated a bolus-chase technique designed to reduce the volume of contrast material and to shorten examination time during intravenous digital subtraction angiography (IV-DSA) of the lower limbs. With this technique, after a single injection of contrast material, two contiguous fields can be sequentially imaged (two-field DSA) using a step translated x-ray tube. 67 patients with peripheral vascular disease were studied. All examinations provided diagnostic information, so that in no instance additional intra-arterial injections were required. With the two-field DSA only 3.49 injections were needed in the average for five fields examined in each patient, resulting in a 30% reduction of contrast agent used.

Non-isocentric applications of biplane digital subtraction angiography

Biplane DSA, particularly with the option of non-isocentric positioning of the two imaging chains, further decreases the risk of angiography by obtaining multiple views of the same area or views of two different anatomic areas during a single injection of contrast material. For example, an aortorenal angiogram can be recorded at the same time as an arch aortogram using a single injection of contrast. Similarly an intracranial view can be recorded with the same contrast injection as an arch aortogram or cervical carotid arteriogram.

10.ステレオDSA(I.Digital Subtraction Angiographyの臨床利用について)(第12回放射線技術)

This report describes a new stereoscopic DSA system using a twin focus X-ray tube which can reconstruct a series of stereoscopic subtraction images by a single injection of contrast medium. Main points which we refer to in this paper are as follows. 1. A real-time stereoscopic view of moving images has been realized on a single TV monitor by this system. 2. A new automatic diaphragm designed for this system and some compensatory filters attached to the image intensifier provide good images without halation. 3. The digital image memories in this system are sufficient enough for large high-speed data acquisition. They are equal to the same series of images taken during conventional stereoscopic serial angiography. 4. The interfocal distance of 63 mm in the X-ray tube provides a stereoscopic pair which can be seen without a sense of incompatibility within a 1.25-fold-magnification through a 10 inch image intensifier. 5. The stereoscopic DSA is greatly appreciated for clinical application.

Rotational arch aortography.

ROTATIONAL ARCH AORTOGRAPHYJAMES R. SNIDER, M.D., KEITH KLOPFENSTEIN, M.D., E. A. MENDELSOHN, M.D. and NEIL E. CROW, M.D.Audio Available | Share

Panhepatography: simultaneous radiographic visualization of all hepatic veins.

Panhepatography, a new method of hepatic phlebography by means of a single injection of contrast medium into the inferior vena cava, is described. Simultaneous arrest of caval flow during injection of contrast medium into the vena cava near the outlet of the hepatic veins enables opacification of all the hepatic veins and their branches. Because of the block at the level of the caval vein, the contrast medium follows a retrograde flow into the hepatic veins.

Cerebral angiostratigraphy: first practical results.

The limitations of the standard angio-stratigraphic procedures with the classical projections, and even with supplementary views (oblique and under-the-chin-bregmatic), led us to devise a technic whereby the intracranial vascular system could be demonstrated at various levels simultaneously. This technic, which has been described in an earlier publication (1), permits dissociation of the different components of the intracranial vessels, freed from confusing superimposed shadows. With a single injection of contrast material, not exceeding in amount that used in standard stratigraphy (10 c.c.), projections of several layers of the cerebral circulation are achieved simultaneously. The advantages of such a procedure are apparent, since repeated injections of the medium for demonstration of individual layers, such as would otherwise be required for this purpose, are obviously out of the question. With the new technic, five stratigrams can be obtained, separated from one another by a distance of 1.0 cm., either...

A cassette changer for aortography and femoral arteriography.

It may be necessary to demonstrate the aorta as well as the peripheral vessels when investigating patients with peripheral vascular disease. With conventional apparatus an injection of contrast medium into the aorta only demonstrates the aorta and iliac vessels. Femoral arteriography is then required to demonstrate the peripheral vessels. The cassette changer described here enables radiographs to be taken of the aorta and peripheral vessels following a single injection of contrast material into the aorta. The principle on which the machine was based was described by Garrow (1957). A box holding cassettes is attached to the tube column of an over-couch X-ray tube so that they move in parallel.

Automatic long-segment serial angiography: a new unit.

Although existing equipment has proved satisfactory for several types of serial angiography covering relatively small areas (cerebral, cardiac, splenic, and aortic), it is increasingly necessary to study longer segments of the vascular system, particularly in the extremities and aorta. The importance of serial roentgenographic examination is now fully accepted. Serial automatic changers covering a small area are available but may require several injections of an opaque medium for study of the entire vascular system of an extremity, with an increased risk to the patient. In some medical centers a variety of manual units have been developed which permit several roentgen exposures of areas up to 14 × 36 inches (1, 2). These long-segment serialographs may provide a satisfactory angiogram with a single injection of contrast material. With the use of manual units, however, there are certain shortcomings: a limited number of exposures, radiation of the physician and technician, and the unreliability inherent in ...