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Related Concept Videos

Imaging Studies IV: Magnetic Resonance Imaging01:27

Imaging Studies IV: Magnetic Resonance Imaging

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Introduction:Magnetic Resonance Imaging, or MRI, can include a specialized imaging technique of the urinary system known as Magnetic Resonance Urography (MRU). This radiation-free technique uses strong magnetic fields and radio waves to produce detailed images with the help of a computer. MRU is particularly effective for visualizing fluid-filled structures like the kidneys, ureters, and bladder.Applications of MRI in the Genitourinary SystemKidneys and Ureters: MRI detects tumors, cysts,...
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Imaging Studies I: Kidney, Ureter, and Bladder Studies01:28

Imaging Studies I: Kidney, Ureter, and Bladder Studies

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Kidney, Ureter, and Bladder (KUB) StudiesKidney, Ureter, and Bladder (KUB) studies are standard diagnostic imaging procedures used to assess the anatomy of the urinary system. They are commonly utilized for patients experiencing abdominal pain or urinary symptoms. By using a simple X-ray of the abdomen, KUB studies can reveal structural and pathological abnormalities within the kidneys, ureters, and bladder. These studies are particularly valuable in diagnosing kidney stones, urinary...
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Imaging Studies for Cardiovascular System IV: CMRI01:21

Imaging Studies for Cardiovascular System IV: CMRI

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Cardiovascular magnetic resonance imaging, or CMRI, is a non-invasive diagnostic test that employs a magnetic field and radiofrequency waves to create precise images of the heart and arteries. It provides comprehensive information about cardiac anatomy, function, perfusion, and tissue characterization without ionizing radiation.IndicationsCMRI diagnoses various heart conditions, including tissue damage from heart attacks, ischemic heart disease, myocarditis, aortic issues (tears, aneurysms,...
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Imaging Studies V: Intravenous Urography and Retrograde Pyelography01:22

Imaging Studies V: Intravenous Urography and Retrograde Pyelography

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IntroductionIntravenous Urography (IVU) and Retrograde Pyelography (RP) are important diagnostic imaging techniques used to evaluate the urinary system. These methods help identify structural abnormalities, obstructions, and functional issues in the kidneys, ureters, and bladder. Both procedures use iodine-based contrast media to enhance the visibility of urinary tract structures on X-ray images, though they differ in their methods and indications.1. Intravenous Urography (IVU)Intravenous...
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Imaging Studies VII: Vascular Imaging01:19

Imaging Studies VII: Vascular Imaging

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DefinitionRenal angiography, also known as renal arteriography, is an imaging technique used to obtain a comprehensive view of blood flow and the vascular structure of blood vessels in the kidneys and surrounding areas.PurposeRenal angiography detects blood vessel abnormalities in the kidneys, such as aneurysms, stenosis, thrombosis, vascular tumors, and renal artery stenosis. It evaluates kidney function and guides interventional treatments like angioplasty or stent placement.Pre-Procedure...
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Magnetic Resonance Imaging01:24

Magnetic Resonance Imaging

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Magnetic resonance imaging (MRI) is a noninvasive medical imaging technique based on a phenomenon of nuclear physics discovered in the 1930s, in which matter exposed to magnetic fields and radio waves was found to emit radio signals. In 1970, a physician and researcher named Raymond Damadian noticed that malignant (cancerous) tissue gave off different signals than normal body tissue. He applied for a patent for the first MRI scanning device in clinical use by the early 1980s. The early MRI...
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Related Experiment Video

Updated: Sep 11, 2025

Evaluation of Patients' Posture and Gait Profile After Lumbar Fusion Surgery by Video Rasterstereography and Treadmill Gait Analysis
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Effect of posture on renal volume: evaluation using multi-posture MRI.

Seiya Nakagawa1,2, Tosiaki Miyati3, Naoki Ohno1

  • 1Graduate School of Medical Sciences, Kanazawa University, 5-11-80, Kodatsuno, Kanazawa, Ishikawa, 920-0942, Japan.

Radiological Physics and Technology
|August 18, 2025
PubMed
Summary

Renal volume measurements using multi-posture MRI reveal significant decreases in total kidney, cortex, and medulla volumes when moving from supine to upright positions in healthy volunteers.

Keywords:
Magnetic resonance imaging (MRI)Multi-posture MRIRenal volumeSupine positionUpright position

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Area of Science:

  • Nephrology
  • Radiology
  • Medical Imaging

Background:

  • Renal volume measurement aids in early renal disease detection and monitoring.
  • The impact of postural changes on renal volume remains unclear.
  • Standard imaging often limits posture variations, hindering comprehensive renal assessment.

Purpose of the Study:

  • To investigate the effect of posture on renal volume using a multi-posture MRI system.
  • To compare renal volumes (total kidney, cortex, medulla, pelvis) between supine and upright positions.
  • To assess the utility of multi-posture MRI in understanding renal volume dynamics.

Main Methods:

  • Utilized a novel multi-posture MRI system capable of imaging in any position.
  • Included 11 healthy volunteers (mean age 23.1 years).
  • Compared renal volumes in supine versus upright postures using Wilcoxon signed-rank test (P < 0.05 significance).

Main Results:

  • Significant reductions in total kidney, renal cortex, and renal medulla volumes were observed in the upright position compared to the supine position (P < 0.05).
  • Renal pelvis volume differences between postures were not statistically significant in this cohort.
  • Multi-posture MRI demonstrated feasibility for dynamic renal volume assessment.

Conclusions:

  • Renal volume is significantly affected by posture, decreasing in the upright position.
  • Multi-posture MRI offers novel insights into renal volume variations.
  • Findings may influence the interpretation of renal volume in clinical settings and disease monitoring.