• An important issue in the evaluation is a careful segmentation of epi- and endocardial borders (Fig. 1A) which has to be done for all slices covering the left ventricle for cardiac phases derived from end systole and end diastole. (bruker.com)
  • An accelerated self-gating (SG) technique, SparseSG, was developed to realize whole-heart coverage of 3D cardiac cine imaging at 3T without ECG and breath-holding. (ismrm.org)
  • Preliminary in vivo study demonstrated that a whole heart coverage of 3D cine imaging can be achieved within 1 min and the technique had excellent performance compared to the standard ECG-triggering and conventional SG methods. (ismrm.org)
  • Good quality CINE images from the fetus in the third trimester were acquired. (ismrm.org)
  • For quantitative evaluation 3 image series have been acquired: 2 single slice IntraGate™-FLASH cine series, one in 2 chamber and one in 4CV view and one multi-slice IntraGate™-FLASH cine SAX scan. (bruker.com)
  • A 4 chamber view of the heart using SSFP cine imaging. (wikipedia.org)
  • CMR in the 4 chamber view comparing the cine (left) with the late gadolinium image using inversion recovery (right). (wikipedia.org)
  • This mode of imaging uniquely provides a cine type of image of the beating heart, and allows the interpreter to determine the efficiency of the individual heart valves and chambers. (wikipedia.org)
  • Measurements of cardiac and respiratory activity during motor imagery and during actual motor performance revealed a covariation of heart rate and pulmonary ventilation with the degree of imagined effort. (wikipedia.org)
  • First, like Blumgart, he emphasized that evaluation of cardiac function required multiple measurements of change over time and these measurements must be performed under same state conditions, without changing the function of the heart in between measurements. (wikipedia.org)
  • By 1963, Dr. William Bruce, aware of the tendency of people with coronary artery disease to experience angina (cardiac chest discomfort) during exercise, developed the first standardized method of "stressing" the heart, where serial measurements of changes in blood pressure, heart rate and electrocardiographic (ECG/EKG) changes could be measured under "stress-stress" conditions. (wikipedia.org)
  • Several techniques such as intracellular recording, patch-clamp, and voltage-clamp technique, pharmacology, confocal imaging, molecular biology, two photon laser scanning microscopy and Ca2+ imaging have been used to study activity at the cellular level. (wikipedia.org)
  • In ASL techniques, saturation, spatial, or adiabatic inversion pulses are applied to water molecules outside the imaging field, and their signal is imaged as they enter the field. (appliedradiology.com)
  • By using magnetic fields and radiofrequency (RF) pulses, the patient's own 1 H nuclei absorb and then emit energy, which can be measured and translated into images, without using ionising radiation. (wikipedia.org)
  • Artifact suppression techniques such as flow compensation, cardiac gating, presaturation pulses, gradient moment nulling, no phase wrap can improve image quality. (ucsd.edu)
  • Ultrasonic images also known as sonograms are made by sending pulses of ultrasound into tissue using a probe. (wikipedia.org)
  • Gradient recalled echo MR imaging of the jugular foramen. (ajnr.org)
  • Dural sinus thrombosis: verification with spin-echo techniques. (ajnr.org)
  • The choice of the gradient-echo time (e.g., in-phase vs opposed-phase conditions) further alters the representation of water and fat signals in the images and will allow for separate water/fat movies. (wikipedia.org)
  • The technique requires delivery of a gamma-emitting radioisotope (a radionuclide) into the patient, normally through injection into the bloodstream. (wikipedia.org)
  • Emissions from the radionuclide indicate amounts of blood flow in the capillaries of the imaged regions. (wikipedia.org)
  • In the same way that a plain X-ray is a 2-dimensional (2-D) view of a 3-dimensional structure, the image obtained by a gamma camera is a 2-D view of 3-D distribution of a radionuclide. (wikipedia.org)
  • The in vivo technique is more convenient for the majority of patients since it is less time-consuming and less costly and more than 80 percent of the injected radionuclide usually binds to red blood cells with this approach. (wikipedia.org)
  • MRI of the coronary arteries is, however, a challenging task owing to motion of the vessels during cardiac contraction and respiration, the complexity of the anatomy in three dimensions, the small calibre of the vessels, and the fact that the vessels are embedded in fat which produces a competing signal. (bmj.com)
  • The difficulty in PET image segmentation is compounded by the low spatial resolution and high noise characteristics of PET images. (springer.com)
  • Surface and other specialty coils enhance the quality of MR images, particularly for small structures that require greater spatial resolution. (ahrq.gov)
  • To overcome physiological motion, such as breathing, 4DCT acquires images at a range of times and positions, allowing the extent of motion to be visualised (e.g. from maximum inspiration to maximum exhalation). (wikipedia.org)
  • Ghosting is a multidimensional artifact that occurs in the MRI in the phase encoded direction (short axis of the image) after applying the Fourier Transform. (wikipedia.org)
  • The capabilities offered by modern radiation therapy units and the widespread availability of combined PET/CT scanners stimulated the development of biological PET imaging-guided radiation therapy treatment planning with the aim to produce highly conformal radiation dose distribution to the tumour. (springer.com)
  • General contraindications to MR such as cardiac pacemakers, ocular foreign bodies, aneurysm clips, and surgical ferromagnetic hardware would lead one to depend upon CT rather than MR. Evaluation of calcification for stones in the salivary duct are more easily detected by CT. (ucsd.edu)
  • It interprets cross sectional imaging studies of the heart and vascular system . (conferenceseries.com)
  • 01). Peak exercise cardiac output, hyperemic calf blood flow, and vascular conductance were unaffected by the conditioning protocol. (ahajournals.org)
  • In angiology or vascular medicine, duplex ultrasound (B Mode vessels imaging combined with Doppler flow measurement) is daily used to diagnose arterial and venous disease all over the body. (wikipedia.org)
  • Patients wait a specific amount of time for the radiotracer to travel to the part of the body that physicians want to image, and then patients go to the scanner, where a gamma-camera captures how their body uses the radiotracer. (utah.edu)
  • Gamma camera PET is markedly inferior to PET imaging with a purpose designed PET scanner, as the scintillator crystal has poor sensitivity for the high-energy annihilation photons, and the detector area is significantly smaller. (wikipedia.org)
  • However, given the low cost of a gamma camera and its additional flexibility compared to a dedicated PET scanner, this technique is useful where the expense and resource implications of a PET scanner cannot be justified. (wikipedia.org)