JPH0581138B

• Main Author: YAMAZAKI KAZUNARI
• Format: Patent
• Language: English
• Published: 11.11.1993
• Edition: 5
• Subjects: DIAGNOSIS; HUMAN NECESSITIES; HYGIENE; IDENTIFICATION; MEASURING; MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES; MEDICAL OR VETERINARY SCIENCE; PHYSICS; SURGERY; TESTING

PURPOSE:To avoid an effect of pseudo echoe for obtaining a picture without any arty fact, by causing an original echoe to leave a refocus time point as it is and causing only the pseudo echoe to get the refocus time point out of a data sampling period. CONSTITUTION:Inclined magnetic field pulses 4 for reading-out are added after inclined magnetic field pulses 2 for reading out a period between first and second 180 deg. pulses, while reading-out inclined magnetic field pulses 5 are added before reading-out inclined magnetic field pulses 3 during a period after the second 180 deg. pulses. An original echoe becomes as shown by the solid line, and a pseudo echoe becomes as shown by the dotted line. The addition of the inclined magnetic field pulses 5 generates the pseudo echoe at a time point Ts that an integrated value of the pulses becomes equal to the total sum of the inclined magnetic field pulses 1. A spin for generating the original echoe avoids any influence, by adding the same amount of the inclined magnetic field pulses 4 after the inclined magnetic field pulses 2, generating a mutual offset, setting a refocus time point to an original time point 2T-2gamma, separating both from each other and getting the pseudo echoe generating time point Ts out of a data sampling period 6.