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- W2351640690 abstract "Objective To study the feasibility and basic technology of the oxygen contrast MR ventilation imaging in lung Methods Six canine lungs were scanned by using inversion recovery pulse sequence with turbo spin echo acquisition before and after inhalation of the 100% oxygen as T 1 contrast agent, and the T 1 values were measured The contrast to noise ratio(CNR) for each inversion recovery time was compared and the relationship between arterial blood oxygen pressure(PaO 2)and T 1 relaxation rate was observed Subtraction technique was employed in the postprocessing of pre and post oxygen conditions Results Molecular oxygen could shorten the pulmonary T 1 value(average 13 37%, t =2 683, P 0 025) The optimized inversion delay time for the best CNR was about the average between the T 1 value of pre and post oxygen conditions The relaxtivity of T 1 resulted in excellent linear correlation( r 2 = 0 997 4)with PaO 2 Through the subtraction of pre and post oxygen image, the oxygen contrast MR ventilation image was obtained Conclusion The oxygen contrast MR ventilation imaging has the feasibility and clinical potential for the assessment of regional pulmonary function" @default.
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- W2351640690 date "2003-01-01" @default.
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- W2351640690 title "The experimental study of oxygen contrast MR ventilation imaging" @default.
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