نتایج جستجو برای: simplified dynamic phantom

تعداد نتایج: 468909  

Journal: :Journal of atrial fibrillation 2011
Jasbir S Sra Elisabeth Soubelet Regis Vaillant David Krum John Hare Barry Belanger Indrajit Choudhuri Anwer Dhala Vikram Nangia M Eyman Mortada Atul Bhatia Zalmen Blanck Ryan Cooley Masood Akhtar

Background: Dynamic motion of the heart due to cardiac and respiratory cycles, and rotation from varying patient positions between imaging modalities, can cause errors during cardiac image registration. This study used phantom, patient and animal models to assess and correct these errors. Methods and Results: Rotational errors were identified and corrected using different phantom orientations. ...

Journal: :iranian journal of radiation research 0
a. takavar department of medical physics, tehran university of medical sciences,tehran, iran gh. shamsipour m. sohrabi m. eftekhari

background: in myocardial perfusion spect imaging, images are degraded by photon attenuation, the distance-dependent collimator, detector response and photons scatter. filters greatly affect quality of nuclear medicine images materials and methods: a phantom simulating heart left ventricle was built. about 1mci of 99mtc was injected into the phantom. images were taken from this phantom. some fi...

Journal: :Journal of biomedical optics 2012
Tsukasa Funane Hirokazu Atsumori Masashi Kiguchi Yukari Tanikawa Eiji Okada

In near-infrared spectroscopy (NIRS) for monitoring brain activity and cerebral functional connectivity, the effect of superficial tissue on NIRS signals needs to be considered. Although some methods for determining the effect of scalp and brain have been proposed, direct validation of the methods has been difficult because the actual absorption changes cannot be known. In response to this prob...

Journal: :Journal of nuclear medicine : official publication, Society of Nuclear Medicine 2009
Sanjiv S Gambhir Daniel S Berman Jack Ziffer Michael Nagler Martin Sandler Jim Patton Brian Hutton Tali Sharir Shlomo Ben Haim Simona Ben Haim

UNLABELLED This study described and validated a new solid-state single-photon gamma-camera and compared it with a conventional-SPECT Anger camera. The compact new camera uses a unique method for localizing gamma-photon information with a bank of 9 solid-state detector columns with tungsten collimators that rotate independently. METHODS Several phantom studies were performed comparing the new ...

Journal: :Transactions of the American Mathematical Society 2007

Journal: :international journal of electrical and electronics engineering 0
ebrahim farshidii sayed masoud sayediii

a log-domain current-mode true rms-to-dc converter based on a novel synthesis of a simplified current-mode low pass filter and a two-quadrant squarer/divider is presented. the circuit employs floating gate mos (fg-mos) transistors operating in weak inversion region. the converter features low power(<1.5uw), low supply voltage (0.9v), two quadrant input current, immunity from body effect, low ci...

Journal: :Physical review 2023

Phantom helix states are a special set of degenerate eigenstates the XXZ Heisenberg model which lie in energy levels around zero and bidirectionally equal. In this work, we study state with Dzyaloshinskii-Moriya interaction (DMI). We show exactly that only one direction remain unchanged presence resonant DMI. Based on Holstein-Primakoff transformation, quantum spin is mapped to boson model, all...

Journal: :iranian journal of medical physics 0
jalil pirayesh islamian department of medical physics, tabriz university of medical sciences, tabriz, iran. mohammad taghi bahreyni toossi department of medical physics, mashhad university of medical sciences, mashhad, iran.

introduction quality control is an important phenomenon in nuclear medicine imaging. a jaszczak spect phantom provides consistent performance information for any spect or pet system. this article describes the simulation of a jaszczak phantom and creating an executable phantom file for comparing assessment of spect cameras using simind monte carlo simulation program which is well-established fo...

Journal: :The European Physical Journal C 2004

نمودار تعداد نتایج جستجو در هر سال

با کلیک روی نمودار نتایج را به سال انتشار فیلتر کنید