| 摘要 |
A magnetic detector locates magnetically tagged items, such as surgical sponges or instalments, introduced to and remaining in the body cavity of a surgical patient. The magnetic detector is a wand or probe that is manually handleable, and spatially manipulable and moveable by an operator such as a medical professional. The detector is moved about at a spatial location of an ambient magnetic field at the patient and operating table. A characteristic of the ambient magnetic field at the spatial location is saved by the detector. The detector is subsequently moved about at the same spatial location If any magnetically tagged item is present in the vicinity of the detector during this subsequent movement at the spatial location an anomalous magnetic effect is detected by comparison of the prior detection reading absent the tagged item to the detection reading in presence of the tagged item in the patient. |
