Computed tomography scanner

X- and Gamma-Ray Computed Tomography Scanners for Industrial Applications. 

A newly developed 7-ray computed tomography scanner was implemented to study liquid flow distribution in a 30.48-cm-diameter column packed with corrugated structure using countercurrent air-water flow. Validation experiments confirm that spatial resolution of 2.5 mm can be achieved by the new CT unit. 

Sone S, Li F, Yang ZG, et al. Results of diree-year mass screening program for lung cancer Cancer using mobile low-dose spiral computed tomography scanner. Br J Cancer 2001 84 25-32. 

Kinahan PE, Hasegawa BH, Beyer T (2003). X-ray-based attenuation correction for positron emission tomography/computed tomography scanners. Semin Nucl Med 33 166... 

Liang Y, Kruger RA (1996) Dual-shce spiral versus single-slice spiral scanning comparison of the physical performance of two computed tomography scanners. Med Phj 23 205-220... 

Cohen, G. and F.A. DiBianca, The use of contrast-detail-dose evaluation of image quality in a computed tomographic scanner. Journal of Computer Assisted Tomography, 1979. 3(2) p. 189-195. 

Various computed tomography CT- scanners for industrial applications have been designed and constructed) They use as radiation sources X-ray tubes or gamma emitting radioisotopes and as detectors NaI(Tl)-scintillators for gamma rays and image intensifiers for X-rays. 

Finally, newer scanners are being developed with both PET and another modality, such as computed tomography (X-ray CT), where a subject would be scanned first with X-ray CT for anatomy and for attenuation correction, and then imaged for their PET or SPECT measurements. 

The newly developed gamma ray computed tomography (CT) scanner design... 

A newly installed computed tomography (CT) scanner was used in this study. This is a modified unit of the third-generation fan-beam configuration originally devel-... 

The adverse effects of contrast agents during computed tomography (CT) are broadly similar to those during excretion urography, but the incidence of serious reactions and deaths may be higher, because reactions are harder to treat when the patient is in a scanner (SEDA-7, 451). Renal insufficiency can occur in patients with diabetes and pre-existing renal disease or as a result of multiple examinations. In Herpes simplex encephalitis. 

Development of the first computer-based medical instrument, the computerized axial tomography scanner, revolutionized cHnical approaches to noninvasive diagnostic imaging procedures, which now include magnetic resonance imaging and positron emission tomography as well. 

Computed tomography (CT) has developed dramatically with the introduction of multi-row detector technology. Especially the abdomen, where motion artifacts due to respiratory motion and bowel peristalsis are disturbing, benefits greatly from this technique. While scanners with 64 or more detector rows are still most common in large community or university hospitals, scanners with between 2 and 16 slices are widely available even in private practice or in small hospitals. With the introduction of multi-detector CT (MDCT) bi- or even tri-phasic examinations of the liver can be combined into a thoraco-abdominal CT examination without compromise with regard to spatial or temporal resolution. The acquisition of the liver with a 64-slice scanner, for example, only requires a few seconds... 

Development of Computed Tomography The mathematical model for reconstructing an object from multiple projections dates back to 1917, when Johann Radon demonstrated mathematically that an object could be replicated from an infinite set of its projections (Hsieh 2009). This concept was applied only many years later. The Nobel Prize winners Allan M. Cormack and Godfrey N. Hounsfield made substantial contributions to the development of computed tomography (Cormack 1979 Hounsfield 1979). The first cUnical CT scan on a patient took place on 1st October 1971 using a prototype scanner developed by Hounsfield. Since the 1970s, CT have rapidly become a fundamental imaging technique in medical practice (Kalender 2006). 

The particles were shown to be multimodal in their capacity to provide both CT and MR contrast. Synchrotron radiation computed tomography (SRCT) phantom imaging was obtained at a gold concentration of 1.4mg mLr which is lower than the detection threshold of a conventional CT scanner. In vivo SRCT images of mice and rats were obtained at a concentration of 10 mg mL7 which corresponds to a 5mM Gd. MR images were enhanced by the presence of the particles. Postmortem ICP mass spectrometry showed the particles to distribute mostly to the kidneys of the animals, where they were readily cleared in the urine. Interestingly,... 

Patient data acquisition is based on spiral CT and the whole data processing part is optimized for it. MRI could be used instead of spiral CT, but is not implemented yet. For spiral CT, scanning multirow detector computed tomography is used in the past the detector used was a GE Lightspeed QXl Scanner (GE Systems, Milwaukee, Wl, USA), but recently there was an opportunity to use a Siemens Somatom Sensation (Siemens Medical System Inc., Forchheim, Germany). 

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