71 articles
Functional ultrasound imaging
Functional ultrasound imaging (fUS, also fUSI) is a neuroimaging method that uses high-frame-rate ultrasound to measure cerebral blood volume changes, applied in rodents, primates, and humans.
Harmonic imaging
Harmonic imaging is an ultrasound method that forms diagnostic images from harmonic frequencies generated as the pulse travels through tissue, giving less noise and better contrast.
Harmonic motion imaging
Harmonic motion imaging (HMI) is an ultrasound-based elasticity imaging technique that assesses tissue stiffness by inducing oscillations with a focused ultrasound transducer and tracking the resulting displacement.
High-frequency ultrasound imaging
High-frequency ultrasound imaging uses acoustic frequencies above the conventional 2–15 MHz diagnostic range to image superficial tissues at near-microscopic resolution, in ophthalmology, dermatology, and intravascular imaging.
Impedance Plethysmography
Impedance plethysmography, also known as rheography or impedance phlebography, is a noninvasive technique that measures blood volume changes through electrical impedance between electrodes on the skin.
Intima–media thickness measurement
Intima–media thickness (IMT) measurement is an ultrasound technique measuring the combined intimal and medial layers of the carotid artery wall to detect subclinical atherosclerosis, introduced in 1986 and now contested in clinical guidelines.
Intraoperative ultrasound
Intraoperative ultrasound (IOUS) is the use of diagnostic ultrasound during surgery to visualize internal anatomy in real time, guiding resection, needle placement, and operative approach; it is routine in liver, pancreatic, and brain tumor surgery.
Lung ultrasound
Lung ultrasound is a bedside, artifact-based imaging method detecting pleural effusion, consolidation, pneumothorax, and interstitial syndrome; its BLUE protocol diagnoses acute respiratory failure causes with 90.5% accuracy.
Lung ultrasound score
The lung ultrasound score is a bedside score that grades aeration loss across 12 chest regions, summing grades of 0 to 3 into a total of 0 to 36.
Micro-ultrasound imaging
Micro-ultrasound imaging is a high-frequency ultrasound technique that images living tissue at resolutions near histology's scale, resolving structures as small as 70 µm and used chiefly to detect prostate tumors.
Microbubbles
Microbubbles are 1–10 µm gas-filled, lipid- or albumin-shelled intravenous contrast agents for ultrasound (CEUS), used in echocardiography and liver lesion characterization; distinct from CT/MRI agents, they stay intravascular, clear via the lungs, and carry no nephrotoxicity.
Microvascular imaging
Microvascular imaging (MVI) is a Doppler ultrasound technique that detects low-velocity blood flow in vessels too small for conventional Doppler, without contrast agents, used to assess tissue perfusion and tumor vascularity.
Multiparametric ultrasound
Multiparametric ultrasound (MPUS) is an imaging approach that combines several ultrasound parameters, including tissue stiffness, attenuation, backscatter, and speed of sound, to characterize tissue for diagnosis.
Neurosonography
Neurosonography is ultrasound imaging of the brain and nervous system, covering neonatal and fetal cranial ultrasound and transcranial Doppler of cerebral vessels since the 1980s.
Perflenapent
Perflenapent (dodecafluoropentane, C5F12; EchoGen, Sonus Pharmaceuticals) is a liquid perfluorocarbon phase-shift ultrasound contrast agent. EU-approved 1998, withdrawn 2001; US NDA withdrawn 2000; superior to Albunex in phase III trials.
Perflubutane
Perflubutane (C4F10), sold as Sonazoid, is a perfluorocarbon gas used in lipid-shelled microbubble ultrasound contrast agents; first approved in Japan in 2006, it enables Kupffer-phase liver imaging and is approved in China, Japan, Korea, Norway, Singapore, and Taiwan.
Plane wave imaging
Plane wave imaging is an ultrasound method that transmits an unfocused plane wave covering the whole region at once, reaching ultrafast frame rates conventional focused scanning cannot attain.
Power Doppler ultrasound
Power Doppler ultrasound is a Doppler imaging mode that maps integrated signal power to brightness rather than velocity, detecting slow flow and tissue perfusion with little angle dependence and no aliasing.
Quantitative ultrasound
Quantitative ultrasound (QUS) analyzes raw ultrasound echo signals to measure attenuation, backscatter, and speed of sound, quantifying tissue properties for bone, liver fat, and breast cancer assessment.
Shear wave imaging
Shear wave imaging is a quantitative ultrasound elastography method that measures how fast shear waves travel through tissue to estimate stiffness, used mainly to stage liver fibrosis without biopsy.
Sonoelastography
Sonoelastography is an ultrasound imaging method that assesses tissue stiffness, used to characterize tumors and stage fibrosis in organs such as the liver, breast, and thyroid.
Sonohysterography
Sonohysterography, also called saline infusion sonohysterography (SIS) or hysterosonography, is an ultrasound technique in which sterile saline is infused into the uterine cavity to detect polyps, fibroids, and adhesions.
Spleen stiffness measurement
Spleen stiffness measurement (SSM) is a noninvasive elastography technique that measures spleen stiffness in kilopascals to assess portal hypertension, notably clinically significant portal hypertension, in chronic liver disease.
Strain elastography
Strain elastography is an ultrasound technique that images how tissue deforms under light compression, showing relative stiffness to help assess lesions in the breast and thyroid.
Strain imaging
Strain imaging is an ultrasound technique that measures how tissue deforms under light compression, displaying relative stiffness as a color map to distinguish benign from malignant lesions.
Stress echocardiography
Stress echocardiography, including dobutamine stress echocardiography, is a cardiac ultrasound method that images left ventricular wall motion during exercise or pharmacological stress to detect coronary artery disease.
Superb microvascular imaging
Superb microvascular imaging (SMI) is a Canon ultrasound Doppler technique that displays low-velocity flow in small vessels without contrast agents, used in breast, thyroid, and liver imaging.
Three-dimensional echocardiography
Three-dimensional echocardiography (3DE) is an ultrasound technique that acquires real-time volumetric images of the beating heart, allowing more accurate and reproducible measurement of cardiac chambers and valves than 2D echocardiography.
Transcranial sonography
Transcranial sonography is an ultrasound technique that images brain tissue through the intact skull, used chiefly to detect substantia nigra hyperechogenicity as a supportive marker of Parkinson's disease.
Transient elastography
Transient elastography, also called vibration-controlled transient elastography (VCTE), is an ultrasound technique that measures liver stiffness in kilopascals to stage fibrosis in chronic liver disease without a biopsy, using a probe that also estimates liver fat.