Model-based iterative reconstruction versus adaptive statistical iterative reconstruction in low-dose abdominal CT
Diomidis Botsikas1, Salvatore Stefanelli, Sana Boudabbous
11 All authors: Department of Imaging and Medical Information Sciences, Division of Radiology, Geneva University Hospital, Rue Gabrielle-Perret-Gentil 4, 1211 Genève 4, Switzerland.
AJR. American Journal of Roentgenology
|July 24, 2014
Summary
Model-based iterative reconstruction (MBIR) significantly improves ureteral definition on low-dose abdominal CT for urolithiasis detection compared to adaptive statistical iterative reconstruction (ASIR). However, MBIR tends to overestimate stone size and density.
Area of Science:
- Medical Imaging
- Radiology
- Image Reconstruction
Background:
- Low-dose abdominal CT is crucial for detecting urolithiasis.
- Iterative reconstruction techniques aim to improve image quality while reducing radiation dose.
- Adaptive statistical iterative reconstruction (ASIR) is a common method, but its efficacy in specific clinical contexts is continually evaluated.
Purpose of the Study:
- To compare the effectiveness of model-based iterative reconstruction (MBIR) against adaptive statistical iterative reconstruction (ASIR) for low-dose abdominal CT in patients with urolithiasis.
- To assess the added benefit of MBIR in visualizing ureteral anatomy and characterizing urinary tract stones.
Main Methods:
- A study involving 53 patients with known or suspected urolithiasis undergoing low-dose abdominal CT.
- Subjective and objective evaluations of ureteral definition were performed by blinded readers.
- Contrast-to-noise ratio (CNR) for soft tissue and fat was calculated.
- Stone characteristics, including position, maximal density, and diameter, were assessed using both ASIR and MBIR.
Main Results:
- MBIR demonstrated significantly superior ureteral definition compared to ASIR (p < 0.0001).
- Mean CNR was markedly higher with MBIR (17.82 ± 4.84) versus ASIR (6.066 ± 1.985) (p < 0.0001).
- MBIR led to significantly higher measurements of stone maximal density (754.4 ± 376.5 HU) and diameter (4.91 ± 2.61 mm) compared to ASIR (p < 0.0001).
Conclusions:
- MBIR offers significant improvements in ureteral definition on low-dose abdominal CT for urolithiasis assessment.
- The systematic use of MBIR may be recommended due to enhanced visualization.
- Clinicians should be aware that MBIR may systematically overestimate stone density and size.
Related Concept Videos
01:27Imaging Studies III: Computed Tomography
887
DefinitionComputed Tomography (CT) of the genitourinary (GU) tract is a non-invasive imaging modality that utilizes X-rays and computer processing to generate detailed cross-sectional images of the urinary system, encompassing the kidneys, ureters, bladder, and adjacent structures such as the adrenal glands.PurposeCT scans of the GU tract serve several diagnostic and therapeutic purposes, including:Diagnosis of Urinary Tract Diseases: Detects kidney stones, tumors, cysts, and congenital...
887
01:22Imaging Studies V: Intravenous Urography and Retrograde Pyelography
3.4K
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...
3.4K
01:30Urinary Tract Calculi III: Medical Management
396
The diagnosis of renal calculi involves several imaging techniques, including non-contrast CT scans and ultrasound. These methods help visualize kidney stones, assess their size and location, and detect possible obstructions. Additionally, Measuring urine pH is useful for diagnosing specific stone types, such as struvite (alkaline pH) and uric acid stones (acidic pH). Cystine stones are primarily linked to cystinuria, a genetic condition. A urinalysis helps detect blood in the urine (hematuria)...
396
01:28Imaging Studies I: Kidney, Ureter, and Bladder Studies
858
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...
858
01:27Imaging Studies IV: Magnetic Resonance Imaging
419
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,...
419
01:24Imaging Studies II: Ultrasonography
884
IntroductionUltrasonography, or renal ultrasound, is a noninvasive medical imaging technique that uses high-frequency sound waves to visualize the kidneys, ureters, bladder, and surrounding tissues.Indications for Urinary System UltrasonographyUrinary system ultrasonography is indicated in various clinical scenarios, such as:Kidney Stones (Urolithiasis): To detect and monitor the size and presence of kidney or urinary tract stones.Hydronephrosis: To assess the dilation of the renal pelvis and...
884