jump to navigation

Researchers capture motion of arteries, lungs November 18, 2008

Posted by tomography in CT, Radiology.
add a comment

Computer tomography has a very high cost/benefit value, and thus is very popular in medicine in general. Capturing high resolution images of the body in no longer an obstacle with today’s modern scanners. However, even the latest and most expensive scanners may have a hard time capturing the motion of arteries and small airways without considerable distortion. Researchers at the RIKEN Advanced Science Institute in Wako, Japan, have developed a system that allows for the capturing of such high quality images in rodents.

They used synchrotron radiation at the SPring-8 Center in Harima, which is much more powerful and predictable than standard laboratory sources, and so achieves high contrast resolution and minimizes blur (Fig. 1). The shutters for x-ray source and detection were synchronized. The sample rodents were anaesthetized, put onto a ventilator, and connected to an electrocardiogram (ECG) machine. The researchers were then able to acquire data at controlled airway pressures and time observations for the periods between heart contractions. For heart and arteries, image acquisition could be timed for the end of breath expiration.

Images acquired with this technique allow for the calculation of gas exchange in small airways, and of shear stress in blood vessels.

photo

Further reading:

– Andras

Advertisements

Molecular Computer Tomography realized October 23, 2008

Posted by tomography in CT, Innovation, PET, Tomography.
Tags: ,
add a comment

Biograph_mCT_Internet.jpg

Siemens Healthcare introduced Biograph mCT at the European Association of Nuclear Medicine conference in Munich, Germany. The latest addition to their scanner line-up offers:

  • 5 minute whole body PET/CT scans with 2mm slice thickness
  • shorter scanning time
  • wider (78cm) ring diameter
  • low patient dose rate
  • up-to 128 slice CT scans

Further reading:

– Andras

GE releases its latest pre-clinical CT scanner August 9, 2008

Posted by tomography in CT, Innovation, Pre-Clinical, Radiology.
add a comment

eXplore CT 120

There has been some words on fast spinning CT scanners on this blog recently, so if you saw those videos and image that GE’s latest pre-clinical CT scanner is able to capture images of the hearth beating as high as 600 bpm, you probably have a hard time imaging what is going on inside this beast! Pre-clinical diagnostic imaging machines are for testing new molecules, drugs and procedures on animals before they are tested on humans. GE has just come out with its latest installment: the eXplore CT 120. It features ECG and respiratory gated cardiac imaging, improved soft-tissue contrast and overall image quality, and “compatibility throughout the eXplore series of imaging systems for seamless PET and SPECT co-registration.” For breathtaking images, visit the official GE website.

– Andras

Blog post of the week: more disembodied scanners August 8, 2008

Posted by tomography in CT, Radiology.
Tags: , ,
add a comment

Thomas, mentioned my last post titled “Under the Hood” in his latest blog post titled “A spinning CT scanner as a cool museum artifact” which is a must read to all our readers as well! So, go ahead and visit his blog for the full article, but here is a little teaser; my favorite video from the post:

– Andras

Under the hood August 7, 2008

Posted by tomography in CT, Radiology.
Tags:
11 comments

It is a rare moment when you get a sneak peak into something that is considered and industry secret. Everyone who has read at least 10 pages from a Radiology book knows how the CT scanner works, but have you ever wondered what it is like to see the scanner during operation with the futuristic white plastic off? I found this on YouTube a short while ago. Trust me, you are going to like it:

I wrote a similar article back in January about a stripped down MRI scanner. You are welcome to read it here.

– Andras

Meet Toshiba’s new scanner: Aquilion One June 21, 2008

Posted by tomography in CT, development, Innovation, Radiology.
3 comments

It is official! Toshiba’s new Aquilion One scanner is out! After 10 years and 500 millions dollars of development, new 320-slice scanners are going online in select hospitals in three major U.S. cities: Baltimore, Boston and Las Vegas. Toshiba gets the last laugh having been previously outpaced by one of its major competitors, Philips Medical Systems. The technological details are impressive:

  • It uses 320 ultra-high-resolution x-ray detectors, each half a millimeter wide
  • The detector rotates every 350 msec
  • Single pass of the brain provides the volumetric data to produce CT angiogram, venogram, digital subtraction angiogram, and whole-brain perfusion images
  • A whole heart can be captured in a single rotation
  • All this with even less radiation burden on the patient

According to the official website your hospital may save considerable amounts of money, if this machine is used in events such as acute chest pain and stroke. For example, in practice this is how it would work out. Let’s suppose a patient comes in with acute chest pain. You examine him, take an ECG reading, order a CT scan, or a nuclear stress scan, and then finally send him to intervention cardiology, where he receives his proper treatment (a stent for example). It is estimated that all this would cost around twice as much (and much more time) as having him lay down in an Aquilion One, and then send him to intervention. I see their point, but I think that this does not hold for all cases as implied by the company website. The emphasis should be on proper events!

By the end of the day it is about people’s lives and correct diagnosis, so I am happy that new advances in technology are helping us achieve those goals easier. If anybody has any images taken with such a high resolution scanner (does not necessarily have to be with this particular type), please email it to us!

Further reading:

– Andras

The whole brain Atlas March 17, 2008

Posted by tomography in CT, education, MRI, Nuclear Medicine, PET, Radiology, Tomography.
add a comment

This morning we’ve received a very helpful comment from Y.S., who is running a medical blog also, prep4md.blogspot.com. He suggested, to visit the site of Harvard Medical School. The library I could explore there was amazing to me.

In The Whole Brain Atlas you can view MRI sections through a living human brain as well as corresponding sections stained for cell bodies or for nerve fibers. The stained sections are from a different brain than the one which was scanned for the MRI images…

foramen monro

A great collection to explore neuroimaging for students and even for MDs. In the Normal brain section you can set slice, anatomical structure, choose between MRI T1 or T2 and even PET. There are some Quicktime motion pictures eg of vascular anatomy. Diseases are sorted, so you can study these separative groups: Cerebrovascular, Neuroplastic, Degenerative and Inflammatory or Infectious disease.

MRIs are allowed anyone to use them with no restrictions as long as you mention their source. Therefor the Copyright information:

All of the images on this site are copyrighted. They were produced with the support of public funds, and we wish to keep them available for public use. You may use them for any purpose which will not interfere with their use by others. We do ask that you SECURE OUR PERMISSION, so that we can track the uses being made.

There is no charge for the permission nor for the use of the images. The permission process is important for our guidance in producing additional images and also for maintaining our public support. We also ask that you credit this site as the source of the image(s), and the National Science Foundation for its support.

Thank you for the tip Y.S!

-Imre

Flick’r misses tomography February 29, 2008

Posted by tomography in CT, MRI, Off Topic, Radiology, Tomography, web 2.0, X-ray.
add a comment

We’ve been posting some really great tools (this and this too -András’s great collection) you can use at your work. One of them was Flick’r, so it’s not the first time you can read about it on our blog, and I’m sure it’s not the last. Surfing this huge base of pictures, I was searching for any groups dealing with radiology or nuclear medicine.

The best way to store, search, sort and share images.

flickr logo

Honestly I wasn’t that successful. Xray is quite popular, but no PET, SPECT images. I think doctors haven’t discovered the great potential, Flick’r provides, yet.

Here are some examples on Flickr Groups about radiology:

  • RadsWiki made by a radiology residental in NYC and the webmaster of for his radiology wiki
  • Nasty xray
  • Real radiology A great radiology group with more than 450 photos detailed!
  • Orthopaedic image library The name tells what it’s about.
  • MRI
  • Tomography Tomographic images of any kind, including but not limited to MRI, PET, and plain old X-ray CT. Photos of the equipment and people used to make the images is fine in limited amounts, but the main focus is the tomographic images.
  • Biopsy Feel free to add imaging of any radiology-guided biopsy procedure.
  • The Bassett Collection: The Basset Collection, which now belongs to Stanford University’s School of Medicine, is the definitive dissection collection available to medical students and instructors. These incredibly detailed dissections show and label most every part of the human body, from its tiniest veins, arteries and nerves to serial cross-sections of the spinal cord.

Hopefully, the number of pictures about radiology or even nuclear medicine will grow exponentially in the near future e.g. at Flickr. It would be useful for students as well, as they cannot always go and see these pics.

-Imre