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Medical Imaging Lab (Graduate School of Biomedical Engineering)
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A medical imaging lab that looks inside the body using ultrasound and light.
AboutAbout the lab
Expanding the world of life phenomena visible with ultrasound.
The Saijo Lab (medical imaging) studies medical imaging technologies, centered on ultrasound, that examine organs inside the body without damaging it.
The lab combines a wide range of engineering methods, from the design of ultrasound transducers to signal and image processing, optical systems, and artificial intelligence.
Its goal is to see in greater detail the spatiotemporal variation of flow inside the body, capillary networks only tens of microns in size, structural changes inside living cells, and the three-dimensional structure of blood vessels.
Graduate students from the Graduate School of Biomedical Engineering and the Graduate School of Medicine research together in the same lab.
Key terms
- Ultrasound transducer
- An element that emits and receives ultrasound
- Ultrasound microscope
- A microscope that uses high-frequency ultrasound of 50–300 MHz to view minute tissue structures at micron resolution
- Photoacoustic imaging
- A technique that captures the ultrasound emitted when tissue heated by laser light expands, and turns it into images
- Doppler effect
- A phenomenon in which the frequency of waves from a moving object changes with its speed. It is used to measure the speed of blood flow
NewsLab news
A master's student won the Excellent Presentation Award at the 72nd Tohoku Regional Meeting of the Japan Society of Ultrasonics in Medicine
A doctoral student's paper won the Best Paper Award at USE2025
A fourth-year undergraduate won the Excellent Presentation Award and the Excellent Paper Award at the 2026 Tohoku Region Young Researchers Presentation Meeting
A master's student won the Student Research Encouragement Award from the Ultrasound Study Group
A master's student won the 34th Encouragement Award at the 71st Tohoku Regional Meeting of the Japan Society of Ultrasonics in Medicine
ResearchResearch themes
The lab aims to expand the world of life phenomena visible with ultrasound while making the most of the strengths of ultrasound imaging. By combining a wide range of engineering methods, from ultrasound transducer design to signal and image processing, optical systems, and artificial intelligence engineering, it works to realize what medicine wants to see and wants to make visible.
*Illustrative imageUltrasound microscopy at the micron scale
The lab develops ultrasound microscope systems and signal processing techniques that visualize minute structures at micron resolution using 50–300 MHz ultrasound. Without staining, they can show the three-dimensional distribution of stiffness and viscoelasticity in tissue sections.
*Illustrative imageUltrasound signal processing to characterize tissue
The lab studies methods that diagnose tissue properties by imaging not only the intensity of ultrasound reflections but also frequency information and minute movements of blood vessels under blood pressure load. Applied to intravascular ultrasound, this has made automatic diagnosis of atherosclerotic tissue possible.
*Illustrative imagePhotoacoustic imaging
When a nanosecond-pulse laser is applied to tissue, thermal expansion generates ultrasound. The lab has independently developed a system that captures this ultrasound and turns it into images, and has succeeded in imaging at various scales, from capillary networks down to single red blood cells.
*Illustrative imageVisualizing flow inside the body
Using the Doppler effect, the lab studies how to image various "flows" in the body, such as blood flow inside the heart, peripheral microvessels, and urine flow, more clearly and in more detail. With the Echo-dynography (EDG) method, it also works on visualizing vortex flow and jet flow inside the heart.
MembersFaculty
The Saijo Lab's members consist of faculty, visiting professors, JSPS invited researchers, research fellows, and doctoral, master's, and undergraduate students.As of 2026
- ProfessorYoshifumi Saijo
- ProfessorMototaka 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: “Hitachi, Ultrasound Diagnostic Scanner, Noblus” Mj-bird / CC BY-SA 3.0 (cropped)
- Ultrasound microscopy at the micron scale: “Sonoscanart13” Sonoscan / CC BY-SA 3.0 (cropped)
- Ultrasound signal processing to characterize tissue: “Doppler Ultrasound and Vascular Sonography Examination in Navi Mumbai, Maharashtra, India” Goleisureintl / CC BY 4.0 (cropped)
- Photoacoustic imaging: “Laser Optics - Idaho National Laboratory” Idaho National Laboratory / CC BY 2.0 (cropped)
- Visualizing flow inside the body: “Doppler ultrasound in long-axis view of axillary and subclavian vein thrombosis” Tony Rosen, Betty Chang, Martha Kaufman, Mary Soderman and David C Riley / CC BY 2.0 (cropped)
- Related lab (Cyclotron Nuclear Medicine Lab (Center for Advanced Quantum Beam Science)): “PET recortada” Muchay Fotografía tomada por este usuario durante el evento / CC0 (cropped)
- Related lab (Antibody Drug Discovery Lab): “Antibody IgG1 structure” Tokenzero / CC BY-SA 4.0 (cropped)
- Related lab (Cardiovascular Medicine Lab): “A cardiac catheterization procedure in the Naval Medical Center San Diego hospital’s cardiac catheterization laboratory” Navy Medicine / Public domain (cropped)
- Related lab (Exercise Science Lab): “Exercise Treadmill Convey Motion” Larry D. Moore / CC BY 4.0 (cropped)
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