COMPUTED TOMOGRAPHY INSTRUMENTATION AND OPERATION. OUTLINE. CT SYSTEM COMPONENTS – DEFINITION OF A SCANNER SCANNER COORDINATE SYSTEM – XYZ, ISOCENTER IMAGING SYSTEM COMPUTER SYSTEM DISPLAY, RECORDING, AND STORAGE SYSTEMS. CT MAIN SYSTEMS. IMAGING SYSTEM COMPUTER SYSTEM
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IN CT – STILL SMALL AND LARGE
CATHODE HEATED UP TO AT LEAST 2,200 DEG. CELSIUS
TO LIBERATE ELECTRONS FOR TRANSIT TO ANODE
SMALLER FOCAL SPOT - Low mA
SMALLER FOCAL SPOT – sharper image
TARGET MADE OF TUNGSTEN
HEAT UNITS CALCULATION
HU= kVp X mA x time
MOST CT TUBES HEAT CAPACITY
3-5 MILLION HU
ENERGY – NO CHANGE
2 * mA = 2 * number of photons
4 * mA = 4 * number of photons
15% INCREASE OF KVP = 2 * mAs
(NOT ENOUGH PENETRATION OF THE PATIENT )
PHOTON STARVATION - NOISE!!!!!
80, 100, 120, 130,140
30, 50, 65, 100, 125, 150, 175, 200, 400
TO MAKE THE BEAM HARDER AND
RECHING THE PATIENT
THE MORE PROCESSORS IN THE COMPUTER
THE SHORTER THE RECONSTRUCTION TIME
While most teleradiology systems purchased over the last decade were intended for on-call purposes, the past two years have seen a rapid increase in the use of teleradiology to link hospitals and affiliated satellite facilities, other primary hospitals, and imaging centers. A number of the enabling technologies needed for effective overread networks, such as more affordable high-speed telecommunications networks and improved data compression techniques, have matured in recent years.
NightHawk Radiology Services has developed an innovative approach to the delivery of radiology services by operating centralized, state-of-the-art reading centers in Sydney, Australia and Zurich, Switzerland. Staffing U.S.-trained, board-certified radiologists specializing in emergency radiology, these locations are ideally situated for U.S. care because when it’s the middle of the night in Boston, it’s daytime “Down Under.” When it’s early morning in Los Angeles, it’s daytime in the Alps. From the centralized reading centers, NightHawk radiologists interpret exams and report the results to attending physicians in real-time, usually less than 20 minutes.