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Local attraction refers to disturbances in compass readings caused by magnetic influences from nearby objects such as metal fences, buried pipes, vehicles, buildings, power lines, or natural iron ore deposits. Small items like wristwatches, steel tools, or belt buckles can also interfere with the compass by creating local magnetic fields that distort the Earth's natural magnetic field. These distortions lead to inaccurate readings, posing navigation and land surveying challenges.Local...
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The potency and duration of action of local anesthetics (LAs) are determined by their pharmacokinetics. Pharmacokinetics describes how LAs are absorbed, distributed, metabolized, and eliminated from the body. When administered to the vascular tissues, LAs are quickly absorbed and enter the systemic circulation, reducing their localized effects. Adding vasoconstrictors such as epinephrine to LAs reduces their absorption into the systemic circulation, making them clinically effective. The...
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Related Experiment Video

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Evaluation of a Nonradioactive Magnetic Marker Wireless Localization Program.

Leslie R Lamb1, Manisha Bahl1, Michelle C Specht2

  • 11 Department of Radiology, Massachusetts General Hospital, 55 Fruit St, WAC 240, Boston, MA 02114.

AJR. American Journal of Roentgenology
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Nonradioactive magnetic markers offer a safe and effective method for breast lesion localization. This wireless technique shows potential to replace traditional wire and radioactive seed methods in surgical excisions.

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Area of Science:

  • Radiology
  • Surgical Oncology
  • Medical Devices

Background:

  • Image-guided needle localization is crucial for accurate surgical excision of non-palpable breast lesions.
  • Conventional methods include wire needle localization (WNL) and radioactive seed needle localization (RSL).
  • These methods have limitations, including invasiveness, radiation exposure, and patient discomfort.

Purpose of the Study:

  • To evaluate the feasibility and effectiveness of a nonradioactive magnetic marker wireless localization technique.
  • To assess the safety and accuracy of magnetic marker placement and retrieval.
  • To compare magnetic marker localization with existing localization methods.

Main Methods:

  • Retrospective review of 188 patients undergoing image-guided needle localization with nonradioactive magnetic markers and surgical excision.
  • Data collected included indications for placement, lesion type, imaging guidance, and surgical margin status.
  • Technical success defined as marker placement within 1 cm of the target.

Main Results:

  • A total of 213 magnetic markers were placed in 188 patients.
  • Technical success was achieved in 96.7% of marker placements (206/213).
  • All markers were successfully retrieved during surgery, with no major or minor complications reported. 21.9% of carcinoma cases required reexcision due to positive or close margins.

Conclusions:

  • Image-guided needle localization with magnetic markers is a safe, feasible, and effective breast lesion localization method.
  • Magnetic marker localization offers a viable alternative to WNL and RSL.
  • This technique has the potential to improve patient outcomes and procedural efficiency in breast surgery.