A closer look at the science
behind better healthcare.
Follow a question from first principles to the clinic. Browse the science of imaging, treatment, materials, and measurement.
325 articles
Deep dives first, then reading editionsAn ECG records voltage differences at the skin, where heart activity is only one contributor. Movement, contact changes and electrical interference can distort the tracing, so signal quality is part of interpretation.
Diffusion moves molecules from regions of higher concentration toward lower concentration through random motion. In biomaterials, this process can shape release, while material breakdown, geometry, and surrounding fluid also influence the result.
Killing bacteria in a dish and helping a wound heal are separate achievements. Cold atmospheric plasma research illustrates why promising mechanisms and early trials must be weighed against clinical evidence and guidelines.
Boundary conditions tell a simulation how its modeled region meets the world around it. By setting those edges, researchers can distinguish a meaningful prediction from an under-specified mathematical exercise.
Protons lose energy as they pass through tissue, with energy deposition rising near the end of their path. The Bragg peak helps explain proton therapy’s potential precision and why range uncertainty still matters.
A bone-facing implant surface has to do more than resist wear: it meets living tissue that can respond to its chemistry and texture. Hydroxyapatite coatings are one way engineers shape that interface.
Elastography turns tissue motion into a map of relative stiffness. Following how a wave travels reveals why this measurement can add information to an anatomical image, while still requiring careful interpretation.
Visible light and x-rays are both electromagnetic waves, yet their different energies change how they interact with tissue. That difference explains why one reveals surface color while the other can image structures through the body.
Ultrasound speckle emerges when many echoes combine, so its grainy texture reflects the physics of sound scattering as well as anatomy. Understanding that texture helps explain both image detail and its limits.
A randomized wound study reported promising changes in ulcer area, while a guideline weighed a wider, uncertain evidence base. The difference illustrates how study results and clinical recommendations answer distinct questions.
A blood pressure reading is a compact report about forces acting in a moving fluid. Understanding how sensors turn physical changes into numbers helps explain what measurements reveal—and what they leave out.
Ultrasound gel removes the air gap between probe and skin so sound can enter the body efficiently. Echo timing and strength then help a scanner map boundaries between tissues in real time.
The word plasma describes technologies with very different operating conditions and purposes. A sealed chamber can sterilize compatible devices, while cold atmospheric plasma is studied for living tissue and has uncertain clinical evidence.
A test detects a target in a particular sample at a particular moment. Its result depends on what the assay measures, how much target is present, and the test’s ability to distinguish signal from absence.
A wrist sensor shines light into tissue and tracks small changes in the returned signal as blood volume varies with each pulse. The device estimates a rhythm from those optical changes, which can be affected by motion and measurement conditions.
Photoacoustic imaging uses absorbed laser energy to create sound inside tissue, then detects those waves with ultrasound equipment. The hybrid method may reveal blood vessels, oxygenation, and other features below the surface.
Ionization removes an electron from an atom or molecule, while excitation raises an electron’s energy without necessarily freeing it. The distinction clarifies how plasmas form and why radiation categories depend on energy transfer.
Sensors can remain powered and still become less dependable as their response changes. Calibration, reference chains, and checks against a device’s intended use help reveal whether a long series of readings still means what it once did.
