PONTIFICIA UNIVERSIDAD CAT ´ OLICA DE CHILE ESCUELA DE INGENIER ´ IA SPATIAL OFF-RESONANCE CORRECTION IN SPIRAL BSSFP-MRF RONAL CORONADO Thesis submitted to the Office of Graduate Studies in partial fulfill- ment of the requirements for the Degree of Doctor in Engineering Sciences Advisor: PABLO IRARRAZAVAL Santiago de Chile, January 2022 © MMXXII, RONAL CORONADO