These deposits appear within 12 hours of the heart attack. ... The technetium heart scan is not dangerous. ... that different views of the heart can be scanned. ...
Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author.While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server.
NUCLEAR MEDICINE IMAGING
Prof Jasmina Vujic
Department of Nuclear Engineering
U C Berkeley
Pictures from www.ge.com
What is Nuclear Imaging?
The process involves injecting into the body a small amount of chemical substance tagged with a short lived radioactive tracer. Depending on the chemical substance used, the radiopharmaceutical concentrates in the part of the body being investigated and gives off gamma rays. A gamma camera then detects the source of the radiation to build a picture. These are called scans.
Radioisotope Treatments or Therapy
Radiotherapy using external beam treatment is used commonly for treatment of cancers (see Oncology). However the use of unsealed, liquid sources in the treatment of disease is important in a few, specialized situations. For example Iodine-131 is taken orally to treat overactive thyroid and cancer of the thyroid.
WHAT CAN WE VISUALIZE ?
Typical dynamic image of a heart
Brain and Liver Tomographic Reconstruction and 3D Rendering
Liver Sagittal, Coronal and Transaxial Slices.
General-Purpose Circular Detector
High-Performance Circular Detector
The modern gamma camera consists of:- multihole collimator - large area (e.g 5 cm ) NaI(Tl) (Sodium Iodide - Thallium activated) scintillation crystal - light guide for optical coupling array (commonly hexagonal) of photo-multiplier tubes - lead shield to minimize background radiation
A crucial component of the modern gamma camera is the collimator. The collimator selects the direction of incident photons. For instance a parallel hole collimator selects photons incident OS the normal. Other types of collimators include pinhole collimator often used in the imaging of small superficial organs and structures (e.g thyroid,skeletal joints) as it provides image magnification. Fan beam (diverging) and cone beam (converging) collimators are often used for whole body or medium sized organ imaging. Such collimators are useful because they increase the detection efficiency because of the increased solid angle of photon acceptance.
The action of a parallel hole collimator
Detail of the pin-hole collimator
The following are the typical features of the scintialltion crystal used in modern gamma cameras
Digital Long Axis Nuclear Medicine Systems
Dual Mode PET/CT Oncology System
Siemens gamma cameras
The e.cam® family of gamma cameras offers total flexibility in matching system requirements to the specific needs of your patients and practice and easy adaptability to your future clinical needs. The e.cam standard single is a cost-effective system that features a clinically versatile open gantry with upgrade pathways to autocontour, whole body planar and SPECT as well as dual-head configurations.
The benefits of the e.cam family Superior image quality from true energy-independent HD3 detectors and ultra-thin pallet
Open gantry is clinically versatile and provides easy access
High system reliabilityand clinical flexibility
Easy and convenient operation
Easy expandability and upgradeability
ECAT ART PET Scanner
The ECAT ART is the first cost-effective PET scanner with
bismuth germanate (BGO) detectors. The system is designed to
be installed in existing nuclear medicine departments, with space requirements comparable to a multidetector single photon emission computed tomography (SPECT) camera. The ECAT ART achieves its economical price and clinical utility by applying several key innovations: continuous rotation of two sections of BGO detectors through the use of slip-ring technology, 3D acquisition and reconstruction, and unique integrated circuit electronics.