THE PHYSICS OF BETTER HEALTH4 DEEP DIVES 320 QUICK EXPLAINERS

Fine blue-violet plasma filaments branch between two horizontal laboratory electrodes.

PLASMA MEDICINE / IN THE LAB

THE DEEP DIVE

Cold Plasma: Chemistry, Dose, and Wound Healing

A close examination of how a cool electrical discharge could influence wound repair, what randomized trials actually measured, and why seconds of exposure do not define a transferable biological dose.

Published 30 Oct 2026·14 min read

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Atmospheric-pressure cold plasma photographed in the University of Bologna's industrial-plasma laboratory. Gas escaping around an electrode produces the branching pattern. Themarnicle / Wikimedia Commons · CC BY 4.0 ↗

FIND YOUR FIELDPlasma Medicine Medical Imaging Radiation & Cancer Sound & Ultrasound Light & Lasers Bioelectricity & Sensors Biomaterials Physics Fundamentals

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Medical Imaging

How MRI Turns Hydrogen into an Image

MRI converts tiny changes in hydrogen-proton behavior into spatial detail. Magnetic fields align the signal, radiofrequency pulses disturb it, and carefully timed measurements distinguish tissue environments without x-rays.

Edition 30 Oct 2026·3 min read

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Light & Lasers

What Makes Laser Light Useful in Surgery?

A laser concentrates light into a narrow, controlled beam that can transfer energy to selected tissue. Wavelength, delivery path, and tissue response shape its surgical uses and its limits.

Edition 10 Jan 2025·3 min read

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Bioelectricity & Sensors

How an ECG Detects the Heart's Electrical Activity

An ECG senses voltage differences at the skin as the heart’s electrical activation spreads and recovers. Its trace reveals timing and rhythm, but a short recording is only a sample of activity, not a diagnosis by itself.

Edition 19 Jun 2025·3 min read

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Radiation & Cancer

How External Beam Radiation Reaches a Tumor

External beam treatment uses imaging, positioning, and planned beam directions to concentrate a prescribed radiation dose in a target. Photons and protons travel differently, while normal tissue exposure remains part of planning.

Edition 9 Feb 2025·3 min read

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Biomaterials

Why Implant Surfaces Matter as Much as Their Bulk

An implant’s exterior is the first part the body encounters. Its chemistry, texture, wear, and coatings can influence immune response and tissue integration, even when the device’s core material is strong and durable.

Edition 25 May 2026·3 min read

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Sound & Ultrasound

Why Ultrasound Frequency Changes Image Depth

Higher-frequency sound can distinguish finer structures, but it fades more quickly as it travels through tissue. Ultrasound operators balance detail against penetration, while echoes and timing turn returning sound into an image.

Edition 16 Mar 2026·3 min read

START WITH THE BUILDING BLOCKS

Big science.
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Energy, fields, particles, and waves. Get to know the ideas that make the instruments work.

The fundamentals

Our editorial approach

Cold Plasma: Chemistry, Dose, and Wound Healing

01 / Quick explainers

How MRI Turns Hydrogen into an Image

What Makes Laser Light Useful in Surgery?

How an ECG Detects the Heart's Electrical Activity

02 / Across the disciplines

How External Beam Radiation Reaches a Tumor

Why Implant Surfaces Matter as Much as Their Bulk

Why Ultrasound Frequency Changes Image Depth

Big science.
Clear explanations.

Energy, Power, and Exposure Time in Medical Devices

Control Groups Help Separate an Effect from Background Change

How a Physical Signal Becomes a Digital Number

01 / Quick explainers

Make some waves.

02 / Across the disciplines

Big science.Clear explanations.

Energy, Power, and Exposure Time in Medical Devices

Control Groups Help Separate an Effect from Background Change

How a Physical Signal Becomes a Digital Number

Big science.
Clear explanations.