Cedars-Sinai Medical Center Non-invasive Cardiac Laboratory will be the first center in the US evaluating the CardioMag Imaging MCG in a clinical environment for the detection of ischemia in an acute coronary syndrome patient population. Patients will be enrolled in a similar protocol at Johns Hopkins Medical Center, Baltimore, Mayo clinic, Rochester, and at Klinikum Hoyerswerda, Germany. The early detection of ischemia (before Troponins become positive) with high negative and positive predictive values may prove cost effective and decrease risk by improving prompt treatment and triage to higher or lower grade monitoring at time of hospitalization.