Proceedings of the International School of Physics "Enrico Fermi.", Volume 76N. Zanichelli, 1981 - Nuclear physics |
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Page 49
... linear - at- tenuation coefficient can be computed from sets of transmission measurements . In most practical scanners a quantity related to linear - attenuation coefficient is computed and displayed . This quantity , the attenuation ...
... linear - at- tenuation coefficient can be computed from sets of transmission measurements . In most practical scanners a quantity related to linear - attenuation coefficient is computed and displayed . This quantity , the attenuation ...
Page 50
... linear - attenuation coefficients of water and the substance for which the attenuation value is H. The constant of proportionality is usually taken to be 500 on the E.M.I. scale and 1000 on the Hounsfield scale . The value of 1000 is ...
... linear - attenuation coefficients of water and the substance for which the attenuation value is H. The constant of proportionality is usually taken to be 500 on the E.M.I. scale and 1000 on the Hounsfield scale . The value of 1000 is ...
Page 53
... linear - attenuation coefficients calculated using eq . ( 4 ) for assumed energies of 65 , 70 and 75 keV . The relation between attenuation value and linear - attenuation coefficient is seen to be very accurately linear for an as- sumed ...
... linear - attenuation coefficients calculated using eq . ( 4 ) for assumed energies of 65 , 70 and 75 keV . The relation between attenuation value and linear - attenuation coefficient is seen to be very accurately linear for an as- sumed ...
Contents
A R D THORNTON | 1 |
Physicists and clinicians | 5 |
The Fourier transform properties of an image | 12 |
Copyright | |
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alveolar amplitude analysis aorta aortic approximately arterial pressure arterial system attenuation value basilar membrane beam blood flow blood pressure C₁ capillary cardiac output circulation clinical cm³ CO₂ cochlea cochlear compartment compliance components computed tomography concentration constant counting rate cross-section cuff decrease detector diameter diastolic distribution effect elastin electrode energy equation filter fluid Fourier transform frame frequency function haemoglobin hair cells halothane heart rate impulse response increase left heart linear linear-attenuation coefficient lung manometer measured medical physics membrane method mmHg muscle normal obtained oxygen P₁ P₂ pacemaker patient peripheral resistance photons physicist physiological pulmonary pulsatile pulse ratio region Rendiconti S.I.F. sample scan scanner segment shown in fig shows signal stroke volume systolic techniques tissues transducer transmural pressure tube ultrasonic V₁ velocity venous system ventilation ventricle ventricular vessel viscoelastic volume wall wave form Windkessel X-ray zero