MR FINGERPRINTING FOR DETERMINING PERFORMANCE DEGRADATION OF THE MR SYSTEM

    公开(公告)号:US20180031653A1

    公开(公告)日:2018-02-01

    申请号:US15547622

    申请日:2016-01-22

    摘要: The invention provides for a method of operating a magnetic resonance system for acquiring magnetic resonance data (152) from a phantom (124) within a measurement (zone 108). The phantom comprises a known volume of at least one predetermined substance ((128), 130). The method comprises the step of acquiring (300) the magnetic resonance data by controlling the magnetic resonance system with pulse sequence instructions (150). The pulse sequence instructions cause the magnetic resonance system to acquire the magnetic resonance data according to a magnetic resonance fingerprinting technique. The pulse sequence instructions specify a train of pulse sequence repetitions. Each pulse sequence repetition has a repetition time chosen from a distribution of repetition times. Each pulse sequence repetition comprises a radio frequency pulse chosen from a distribution of radio frequency pulses. The distribution of radio frequency pulses cause magnetic spins to rotate to a distribution of flip angles. Each pulse sequence repetition comprises a sampling event where the magnetic resonance signal is sampled for a predetermined duration at a sampling time before the end of the pulse sequence repetition. The method further comprises determining (302) one or more performance degradation conditions of the magnetic resonance system by comparing the magnetic resonance data with a magnetic resonance fingerprinting dictionary (154). The magnetic resonance fingerprinting dictionary contains a listing of magnetic resonance signals for a set of system states in response to execution of the pulse sequence instructions for each of the at least one predetermined substance.

    ADVANCED WARNING INDICATOR FOR EMERGENCY MEDICAL DEVICES

    公开(公告)号:US20180001097A1

    公开(公告)日:2018-01-04

    申请号:US15540119

    申请日:2015-12-24

    IPC分类号: A61N1/39 G06F19/00

    摘要: An emergency medical device (20) (e.g., an external defibrillator/monitor) employing an emergency medical subsystem (21) for executing an emergency medical procedure (e.g., a monitoring subsystem (21) and a therapy subsystem (21)), and an emergency medical controller (23) for controlling an activation of the emergency medical subsystem (21). The subsystem (21) includes one or more operational components (22). In operation, the controller (23) conditionally actuates a device readiness indicator (24) (e.g., auditory or visual) indicative of an operational readiness of the operational component(s) (22), and conditionally actuates a failure warning indicator (25) (e.g., auditory or visual) indicative of a pending failure of the operational readiness of the operational component(s) (22). The failure warning indicator (25) may be actuated based on a predictive failure analysis of a premature degradation of the operational component(s) (22), a repeated occurrence of error conditions of the operational component(s) (22) (particularly recoverable error conditions), and a shortened reliable life of the operational component(s) (22).