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Medical Imaging Lab
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A lab studying medical imaging that uses ultrasound to visualize the inside of the body.
AboutAbout the lab
Looking inside the body with ultrasound, without harming it.
The Medical Imaging Lab researches medical imaging technologies that use ultrasound to examine conditions inside the body without damaging it.
The lab combines a wide range of engineering methods, from the design of ultrasonic transducers to signal and image processing, optical systems, and artificial intelligence engineering.
Prof. Saijo is in charge of both the Graduate School of Biomedical Engineering and the Graduate School of Medicine, and graduate students from each school conduct research together.
The lab is located in the Electronic Information Systems and Applied Physics Building 1 on Aobayama Campus and in the Institute of Development, Aging and Cancer on Seiryo Campus.
Key terms
- Ultrasonic transducer
- A component that generates ultrasound and receives the ultrasound reflected back. Also called an ultrasonic vibrator
- Photoacoustic imaging
- A technique that irradiates tissue with pulsed laser light and captures the ultrasound produced by thermal expansion with a sensor to form an image
- Doppler effect
- A phenomenon in which, when ultrasound hits a moving object, the frequency of the reflected wave changes according to its speed. It is used to measure flows such as blood flow
NewsLab news
A master's student received the Excellent Presentation Award at the Academic Meeting of the Tohoku Branch of the Japan Society of Ultrasonics in Medicine
A doctoral student's paper received the Best Paper Award at USE2025
An undergraduate student received the Student Excellent Presentation Award and the Young Researcher Excellent Paper Award at the Tohoku Area Young Researchers' Presentation Meeting
A master's student received the Student Research Encouragement Award from the Ultrasonics Research Group
A master's student received the 34th Encouragement Award at the Academic Meeting of the Tohoku Branch of the Japan Society of Ultrasonics in Medicine
ResearchResearch themes
Ultrasound imaging offers real-time performance, safety, and portability, and is used in many medical settings, from emergency care to home care. Building on these strengths, the lab aims to expand the world of life phenomena that ultrasound can reveal.
*Illustrative imageAcoustic microscopy for micron-scale structures
The lab develops acoustic microscope systems and signal processing techniques that use 50–300 MHz ultrasonic transducers to visualize microstructures at the micron scale. Without staining, they can show the three-dimensional distribution of stiffness and viscoelasticity in tissue sections.
*Illustrative imageSignal processing to distinguish tissue properties
The lab works on methods that image not only the intensity of ultrasound reflections but also frequency information and minute motions of blood vessels, in order to diagnose tissue properties. Applied to intravascular ultrasound, this has made automatic diagnosis of arteriosclerotic tissue possible.
*Illustrative imageImaging blood vessels with photoacoustic imaging
The lab captures the ultrasound emitted by tissue irradiated with nanosecond-pulse laser light and turns it into images. With its original system, it has succeeded in imaging at various scales, from capillary networks to single red blood cells, and is also working on visualizing the distribution of oxygen saturation in vascular networks.
*Illustrative imageVisualizing flows inside the body
Using the Doppler effect, the lab produces clearer images of various flows inside the body, such as blood flow inside the heart, peripheral microvessels, and urine flow. With the Echo-dynamography (EDG) method, it visualizes vortex flows and jet flows inside the heart.
MembersFaculty
The lab's members consist of faculty, visiting professors, research fellows, JSPS invited researchers, doctoral, master's, and undergraduate students, and visiting students.As of 2026
- ProfessorYoshifumi Saijo
- Professor (Office for Promotion of the Biomedical Engineering Education System Development Project)Mototaka Arakawa
- Assistant ProfessorTakuro Ishii
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Report an errorAbout the images
The top and research theme images are illustrative and were not taken at the lab. They are cropped from Wikimedia Commons images. Cropped CC BY-SA images are provided under the same CC BY-SA license as the original (version shown on each line).
- Top image: “Pancreas ultrasound doppler” Ptrump16 / CC BY-SA 4.0 (cropped)
- Acoustic microscopy for micron-scale structures: “EFR-0SB40K23 internal view” Mister rf / CC BY-SA 4.0 (cropped)
- Signal processing to distinguish tissue properties: “Abdominal Ultrasound Imaging in Navi Mumbai” Goleisureintl / CC BY 4.0 (cropped)
- Imaging blood vessels with photoacoustic imaging: “Femtosecond Laser and Pulse Compressor - Optics Lab - INRIM” Giorgio Brida from Torino, Italy / CC BY 2.0 (cropped)
- Visualizing flows inside the body: “Doppler Ultrasound and Vascular Sonography Examination in Navi Mumbai, Maharashtra, India” Goleisureintl / CC BY 4.0 (cropped)
- Related lab (Future Electronics Foundation Creation [Kuroda] Lab): “FUGA 18 Retina” Mister rf / CC BY-SA 4.0 (cropped)
- Related lab (Acoustic Wave Physics and Engineering [Yoshizawa] Lab): “Diagram showing liver lesioning using a HIFU transducer” James Ross McLaughlan / CC BY-SA 4.0 (cropped)
- Related lab (Pathological Nanosystems Biomedical Engineering Lab): “Confocal Microscope (NIH BioArt 86)” Courtesy of NIAID Ryan Kissinger / Public domain (cropped)
- Related lab (Electromagnetic Wave Engineering [Chen-Konno-Sato] Lab): “XEMU Antenna Testing in JSC's Anechoic Chamber (jsc2021e022488)” NASA Johnson Space Center / Norah Moran / Public domain (cropped)
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