Tutorial Introduction to X-ray Computed Microtomography Data Processing - An excellent introduction to real-world computed tomography. This tutorial (and the included IDL code) was very useful to me when I built my first CT scanner and needed to write my own reconstruction software.
Principles of Computerized Tomographic Imaging - An excellent (and free) online textbook about CT. Includes a lot of good and useful information about image reconstruction.
Computerized Tomography - A site that describes some of the mathematics behind CT. Definitely worth a look.
Image Reconstruction from Projections - Another good site that includes some of the mathematics behind CT reconstruction.
The Basics of MRI - A good online introductory text for MR physics. The author uses animation well (unlike 99% of the sites out there).
A seminar on k-space applied to medical ultrasound - Not exactly typical ultrasound reading, but a very good and interesting text that will teach you a lot more about ultrasound than most other ultrasound physics books.
An Inexpensive X-ray Machine - Don't be foolish enough to even think about doing this, but it's a good read about what it would take to build your own x-ray tube (not much, but, again, don't even think about it).
NIST X-ray Atomic Tables - Not really a modality, but I need this link because I am always looking up this data for my own research.
NIST X-Ray Mass Attenuation Coefficients - The other set of data for NIST that I need all the time.
Modulation Transfer Function - A good description of the MTF.
PubMed - The ultimate place for searching the literature.
Web of Knowledge - What seems to be an unnecessarily slow and difficult site, though it is a necessity for finding references that are not in the medical literature.
Medical Physics - For some reason the regular interface to Medical Physics always fails for me, and I have to search forever to find this site, which can get the articles for me. It won't work for you if you're not on the VU campus.
NIH eRA Commons - Essential site for NIH-funded researchers (and those who want to be).
NIH Awards to Radiology Departments - Some people think it's important to be in the top 10. As of this posting, only 2003 data is available, but 2004 data should be coming soon.
Congressionally-Directed Medical Research Programs - Well, they haven't had the wisdom to fund any of my work so far, but the site is essential if you even want to try to get money from them.
NSF Fastlane - Sure, they've turned me down, too. But, of course, you need this site if you even want to try.
Med Students - The STR (Society of Thoracic Radiology) Curriculum in Cardiothoracic Radiology for Medical Students.
Residents - STR (Society of Thoracic Radiology) Curriculum in Chest Radiology for Diagnostic Radiology Residents.
STR Educational Resources - Edcational resources from the STR. Includes syllabi from past meetings.
Medical Student Lecture Series - The medical student lecture series that I developed. You need like four passwords to get through all of this, so if you want to see them just sign up to take the clerkship.
Radiology Notebook - Not much here right now, and I'm not doing any more with the site until the book is finished, but there are a few bits of information in here.
Medikali - A free and open source program for creating online teaching file databases. I use this, and it is excellent. Don't even think about buying someone's program until you check this one out.
ACR Codes - A lot of sites list these codes, but this is the most useful one I've found for quickly navigating the codes.
B-Readings - Not exactly a teaching file, but a wealth of information about B Reading, including lots of images.
Chest Schedule - The all-important schedule for the chest section.
Radiology Residents - The home of the Vanderbilt Radiology Residents.
Departmental Home Page - The ever-improving but not-quite-there-yet website for the Vanderbilt Department of Radiology and Radiological Sciences.
Vanderbilt Thoracic Radiology - The files you need if you're a resident on the chest service (or studying for your Boards). Hint: go to the "contents."
VUMC - The Vanderbilt University Medical Center site. Nothing is where you would expect it to be, and if you try to search for a site, be prepared to wade through a barrage of ancient news stories from the Reprter.
PACSweb - The web access to the PACS system. It's sometimes faster to drive to the hospital and look on a regular station.
Webmail - Web access to the pro-Microsoft email system that we have at the medical center.
MXISystems - Not a part of Vanderbilt, but they work closely with us and they are integral to my current research. Read about their monochromatic x-ray source.
FEL - The W. M. Keck Vanderbilt Free-electron Laser Center. The monochromatic x-ray source was initially developed and is still housed here.
FEL Information - Information about FEL's around the world. Not really useful to me, but it's an interesting read every now and then.
VUIIS - The Vanderbilt University Institute of Imaging Sciences. All kinds of good imaging research going on here.