Diagnostic uses of metal detectors: a review

Conners, Gregory P.

doi:10.1111/j.1742-1241.2005.00456.x

Cited by 6 publications

(4 citation statements)

References 40 publications

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“…According to the literature, the use of handheld metal detectors to identify the location of ingested aluminum (eg, flip top of a soda can) may be more sensitive since aluminum is often radiolucent [24]. Thus, metal detection may be superior to radiography in the case of aluminum location [13]. However, even radiopaque foreign bodies may be difcult to localize, thus in cases when metal object is ingested based on medical history the referral of endoscopy should be considered [14].…”

Section: Discussionmentioning

confidence: 99%

Magnetiniai svetimkūniai vaikų virškinamajame trakte: klinikinė išraiška, diagnostika, gydymas

Daškevičiūtė¹,

Kolevinskaitė²,

Trainavičius³

2017

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Įvadas Dauguma į virškinamąjį traktą patekusių svetimkūnių pasišalina savaime, tačiau nuryti magnetiniai svetimkūniai dėl tarpusavio traukos per žarnyno sienas gali sukelti gyvybei grėsmingų komplikacijų.Tikslas Nustatyti magnetinių svetimkūnių virškinamajame trakte klinikinę išraišką, diagnostikos ir gydymo metodus.Metodai Atlikta retrospektyvioji VUL SK Vaikų ligoninėje 2011 m. sausio–2016 m. sausio mėn. laikotarpiu gydytų magnetinių svetimkūnių virškinamajame trakte atvejų analizė. Rinkti ir analizuoti pacientų demografiniai, klinikiniai, radiologiniai duomenys ir operacijų protokolai.Rezultatai Tiriamuoju laikotarpiu nustatyti septyni magnetinių svetimkūnių virškinamajame trakte atvejai. Trims pacientams magnetai rasti skrandyje, šiems pacientams simptomų nebuvo, dviem iš jų buvo atliktas endoskopinis magnetų šalinimas. Trims pacientams magnetai rasti plonojoje žarnoje, du pacientai skundėsi pilvo skausmais, abiem atliktas laparoskopinis magnetų šalinimas. Vienam besimptomiam pacientui magnetai rasti storojoje žarnoje, jie pasišalino savaime paskyrus vidurių laisvinamuosius vaistus.Išvados Diagnozavus magnetinius svetimkūnius virškinamajame trakte, pacientą būtina aktyviai stebėti arba magnetinius svetimkūnius šalinti dėl didelės komplikacijų rizikos.

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Section: Discussionmentioning

confidence: 99%

Magnetiniai svetimkūniai vaikų virškinamajame trakte: klinikinė išraiška, diagnostika, gydymas

Daškevičiūtė¹,

Kolevinskaitė²,

Trainavičius³

2017

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“…More recently, portable handheld metal detectors have been widely reported in localizing swallowed metallic objects, particularly in pediatric coin ingestion cases. [61,62] The diagnostic use of metal detectors for localizing ingested foreign metal objects was systematically studied by Arena and Baker in 1990, demonstrating 100% sensitivity and specificity compared to X-ray radiography. [63] This approach was considered cheaper, faster, and less harmful to the patient.…”

Section: Introductionmentioning

confidence: 99%

Electronic‐Free Traceable Smart Capsule for Gastrointestinal Microbiome Sampling

Nejati,

Sarnaik,

Gopalakrishnan

et al. 2024

Adv Materials Technologies

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Non‐invasive smart electronic‐free sampling capsules have revolutionized the exploration of microbiome‐disease interactions in inaccessible regions of the gastrointestinal (GI) tract. However, a significant impediment to the broader use of electronic‐free capsules is the challenge of reliably tracking and determining their in vivo location. Variability in patient motility introduces uncertainties in capsule position. Thus, there is a critical need for effective solutions that ensure traceability in microbiome studies employing such capsules. While tracking methods are explored in previous smart ingestible capsule designs, most have relied on RF, imaging, and radiation‐based techniques, limiting sampling volume, increasing costs, complicating design, and raising health concerns due to ionizing radiation exposure. To address these challenges, the design of an electronic‐free smart capsule is introduced that integrates a metal tracer for easy metal detection, serving as a reliable tracking mechanism. The capsule is housed in a 3D‐printed casing and includes a superabsorbent hydrogel serving as both a sampling medium and an actuator within the capsule. The capsule's targeted sampling of the GI tract is accomplished by covering the capsule's sampling port with a pH‐responsive coating. Optimal dimensions and material for the cylindrical shaped metal tracer on the capsule are determined through extensive optimizations, considering factors such as gastric flotation, corrosion resistance, read distance, and omnidirectional detectability. The results of these investigations reveal that a 12 mm stainless steel (SS 316L) cylinder offers the necessary detection and tracing capabilities with minimal toxicity and excellent corrosion resistance under relevant physiological conditions in the GI tract. Validation studies, both in vitro and in vivo, confirmed the capsule's trackability using a handheld metal detector. These findings are further validated by X‐ray imaging and CT scans, demonstrating the metal detector's ability to distinguish approximate GI tract regions and determine the time point of excretion. This innovative approach provides a reliable and cost‐effective solution for tracking electronic‐free smart capsules, enhancing their applicability in microbiome research for both human and animal studies.

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“…Recently, magnetic field sensors have many applications in various fields, such as position tracking, navigation, detection of ferromagnetic objects, guided surgery, space research, nondestructive testing, metal detection, etc. [1][2][3][4]. There are many candidates for magnetic sensors, such as giant magneto ________ impedance (GMI) sensors [5], anisotropic magnetoresistance (AMR) [6], giant magnetoresistance (GMR) sensors [7], and tunneling magnetoresistance (TMR) sensors [3,8].…”

Section: Introductionmentioning

confidence: 99%

Design and characteristics of contactless small-magnetic-metal detector base on tunnel magnetoresistance sensors in differential circuit

Thanh,

Lien,

Nam

2024

MaP

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Unexpected metal pieces are significant problems for food and pharmaceutical manufacturers. Commonly, conventional coil metal detectors are used to detect these metal pieces. However, these detectors can only detect cm-size metal pieces, making it challenging to detect mm-size metal pieces. This paper presents an advanced contactless small-magnetic-metal detector based on tunnel magnetoresistance sensors (TMR). To improve the system's sensitivity, the differential circuit combined with a simple AC-bias lock-in amplifier was designed to reduce the noise of TMR sensors. The sensitivity of this designed detection system is 0.44V/mm with a good linearity of R2=0.82674. The experimental results demonstrate that the fabricated prototype can detect the 100 – μm diameter and 1-mm length metal wire. Due to high sensitivity and low-cost fabrication, this system is promising to apply on the manufacturing lines for detecting unexpected tiny metal pieces.

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Diagnostic uses of metal detectors: a review

Cited by 6 publications

References 40 publications

Magnetiniai svetimkūniai vaikų virškinamajame trakte: klinikinė išraiška, diagnostika, gydymas

Magnetiniai svetimkūniai vaikų virškinamajame trakte: klinikinė išraiška, diagnostika, gydymas

Electronic‐Free Traceable Smart Capsule for Gastrointestinal Microbiome Sampling

Design and characteristics of contactless small-magnetic-metal detector base on tunnel magnetoresistance sensors in differential circuit

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