WEBSITES : COMPUTED
Useful Websites on Computed Tomography
is a trend setting website created by Dr Elliot K. Fishman,
from the Johns Hopkins Medical Institutions in Baltimore. It is a portal dedicated
entirely to the many facets of Computed Tomography and comes forward as an excellent
teaching aid. The highlight of the site undoubtedly, is the compendium of CT teaching
files that currently holds 100 double sets of CT images each in nearly 40 modules
based on regional categories. There are a variety of protocols on multidetector
CT, spiral CT as well as 3D Vascular atlas with volume rendering displaying scanning
protocols, 3D Musculoskeletal Pathology atlas, anatomic drawings, full-text literature
references and a journal club.
on Physical Principles of CT Imaging at http://www.slaney.org/pct/
is a physics exposition on the Principles of Computerized Tomographic Imaging.
Authored by A C. Kak and M Slaney, this free electronic version is also available
as a Adobe PDF File. The sections covered include signal-processing fundamentals,
algorithms for reconstruction, the Fourier slice theorem, Three-dimensional reconstructions,
and measurement of projection data, aliasing artifacts and noise in CT Images
represents Imaging Performance Assessment of CT scanners.
ImPACT is the UK's national CT evaluation centre providing CT services
to the UK's NHS. Funded by Medical devices agency the centre has members involved
in work on the first EMI CT scanner at Atkinson Morley's Hospital in the late
1970s. Besides technical evaluation of new multi-slice CT scanner models, consultancy
services, detailed imaging, dose and user data, the site gives an idea of evaluation
of the overall CT system function. Other highlights of the site includes material
on CT Dosimetry spreadsheet, Updates on CT Fluoroscopy & Real Time CT Technology,
CT Scanner matching and Multi-slice CT Technology and slides presentation on Multislice
(Centre d'Imagerie Diagnostique) Diagnostic Imaging Center, Lausanne, Switzerland
has a stylish imaging atlas of the body. The Online Atlas of Human Anatomy
is named DAVID, and has both CT and MRI images to illustrate (with labels) various
sections such as brain, skull, petrous pyramid and inner ear, neck, thorax, spine,
abdomen and shoulder. This is an excellent teaching aid for the professionals
and can be used as a reference tool as well. Also available are GALLERY: a database
of interesting cases and MINERVA : an online tool for medical diagnosis using
differential diagnosis lists
CT Protocols for Intravenous Contrast Injection
is a site containing CT scanning protocols developed by S B. Halls, for enhanced
spiral scanning at the Cross Cancer Institute, Edmonton, Alberta, Canada. The
protocol for injecting contrast agents for CT (called the "Cross Method",
after the institute) has a chart containing variables such as the region of scan,
age, weight, amount and rates as part of the input. Put simply, the table's main
function is to tell "How fast" and "How much" contrast agent should be injected
during the scan to the Radiologist performing CT scans.
A Spiral CT
Protocols at http://www.realtime.net/~bear/ct_protocol/general.htm
is a ready reckoner of Spiral CT Protocols. The protocols are conveniently classified
into regions. To illustrate, the General Head/Brain section contains protocols
on Head, Sella, Internal auditory canal, Temporal Bone and also includes Pediatric
Head, Circle of Willis, TMJ, Orbit and Sinus.
Endoscopy: Development and Evaluation using
the Visible Human Datasets at http://www.nlm.nih.gov/research/visible/vhp_conf/robb/robb_pap.htm is
a complete presentation on Virtual endoscopy by R.A.Robb, from the Mayo Foundation
Clinic, Rochester. The fascinating area of using computer processing of 3-D image
datasets from CT or MRI scans to provide simulated visualizations of specific
organs is exhaustively dealt and well illustrated with many figures and videos
appended to it. Incidentally, this original work was presented at the Visible
Human Project Conference, at National Library of Medicine, National Institutes
of Health, Bethesda, Maryland.
CT Scan at http://www.multislice-ct.com
is a website dedicated to multidetector-row helical CT. This sponsored site from
Schering has sections on Clinical applications, Updates and research. The site
is designed to give detailed information about this promising new diagnostic tool,
the multidetector-row or multislice helical / spiral-CT. At the moment the site
is still in its stage of infancy, and will need expansion paralleling the the
clinical progress achieved by this developing CT-modality.
guidelines : CT Quality Criteria at http://www.drs.dk/guidelines/ct/quality/index.htm
is a review of quality issues in CT. The important areas covered include good
imaging quality implementation, parameters for ideal CT scan of regions, and optimal
techniques for HRCT with exhaustive references.
Spiral CT Site has an interesting feature titled Guidelines in Spiral CT enhancement
This guide designed for techninicians and future users of the Spiral CT, has
four sections covering Spiral CT of the Head, Neck, Chest and the Abdomen.
CT Library at http://www.netmedicine.com/xray/ctscan/ct.htm
is a basic CT scan image database containing by and large cases encountered
in emergency medicine. A variety of region wise categories are maintained with
commonly encountered disorders. The sections has an assortment of cases within
topics such as Head Trauma, Infarcts, Mass Lesions, Aortic Dissection, Pneumothoraces,
Abdomen Trauma, Liver Laceration, Splenic Laceration, Acute Appendicitis etc.
Similarly, Trauma Radiology at http://www.trauma.org/radiology/
is essentially an Image bank covering CT images of a diverse group of
disorders affecting various systems.
on CT dose at http://www.gemedicalsystems.com/rad/ct/ctdose.html
makes interesting reading. CT Instrumentation at http://www.t2star.com/ct_phy/ct_phy_1/ct_phy_1.html deals
with essential physics of a computed tomographic scanner with self-assessment
questions at the end of the module to test one's knowledge. Multislice Helical
CT at http://www.indyrad.iupui.edu/public/lectures/multislice/index.htm
is a slide presentation produced from Department of Radiology at Indiana University
School of Medicine, dealing with Physics, Image Reconstruction Principles, Scanning
Techniques and Clinical Applications of Multislice CT scan. Spiral CT Protocol
Optimization & Quality Assurance is the central theme of the slide presentation
available from the Department of Radiology at University of Iowa at http://dolphin.radiology.uiowa.edu/ge/Slides/CTPhys3/index.htm.
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