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radiology mri radiodiagnosis mri physics mr sequences gradients mri safety magnet magnetic resonance imaging protons radiographers cva imaging in stoke ct aspects score stroke mullerian duct anomalies pid histrosalpingography tuberculosis imaging polycystic ovarian diseases ultrasound mda images tb medicine genital tuberculosis hsg female infertility pcod gynecology pelvic ultrasound stir dr deepak fatsat flair diffusion t2 t1 mr gradients deepak garg k space basic physics hardware safety down syndrome omphalocele tef maconium peritonitis imaging in fetal git anomalies level 2 usg gastrochiesis usg tracheo esophageal fistula maconium aspiration prenatal ultrasound fetal git ovulation study