Computed tomography Department of Radiology, University Medical School, Szeged
voxel +1-4 +2 +5 +3 +1 0-2 pixel -2 0 +1-4 -6 +5 +2 +1 Department of Radiology, University Medical School, Szeged
Spiral (helical) CT Continuous table feed & tube rotation Continuous data acquisition Volumetric data-set Department of Radiology, University Medical School, Szeged
Multislice CT multislice (2-256 detector-row) subsecond scan-time ultrasound paradigm 3D applications cardiologic applications whole body imaging virtual endoscopy Department of Radiology, University Medical School, Szeged EURATOM directive: ALARA principle
SDCT vs. MDCT Department of Radiology, University Medical School, Szeged
Multislice CT Department of Radiology, University Medical School, Szeged
Dual source CT Department of Radiology, University Medical School, Szeged
Electron-beam CT Department of Radiology, University Medical School, Szeged
What is it good for? Brain (injuries, stroke) Bones (injuries, tumors) Lung (parenchyma, bronchography, cc-screening?) Vessels (angiography, embolization, sclerosis) Heart (coronary, perfusion, function) GI tract (virtual endoscopy, tumor, inflammation) Abdominal/retroperitoneal organs (tumor, inflammation) Enhancement pattern Department of Radiology, University Medical School, Szeged
Magnetic resonance imaging Lauterbur, Mansfield (1973) Nobel-prize Department of Radiology, University Medical School, Szeged
200 hemangioma cyst 150 hemorrhage abscess 100 fat 50 0 liver muscle fibrosis 0 0,5 1,0 1,5 2,0 2,5 T1 (sec) Department of Radiology, University Medical School, Szeged
MR contrast materials (i.v. & endoluminal) Paramagnetic: gadolinium T 1 signal increase iv. administration Superparamagnetic (ferromagnetic): iron-oxid (SPIO) T 2 signal decrease iv. or GI administration Organ-specific CM hepatocyte RES Department of Radiology, University Medical School, Szeged
Advantages of MRI good soft tissue characterisation direct multiplanar imaging dynamic measurement MR angiography no ionizing radiation no iodinated contrast material in vivo spectroscopy diffusion imaging perfusion imaging functional imaging in vivo spectroscopy Department of Radiology, University Medical School, Szeged
Disadvantages of MRI movement artefacts poor spatial resolution contraindications claustrophobia Department of Radiology, University Medical School, Szeged
Advantages of computed tomography good spatial resolution good contrast resolution fast imaging multiplanar reconstruction dynamic/multiphasic measurement CT angiography virtual endoscopy intervention Department of Radiology, University Medical School, Szeged
Disadvantages of CT ionizing radiation need for contrast material poor soft tissue characterisation not directly multiplanar Department of Radiology, University Medical School, Szeged
Components of CT gantry: x-ray tube, collimator, cooling, detector (crystal or gas), cables or slip ring computer and operator console workstation printer (thermo or laser) archive Department of Radiology, University Medical School, Szeged