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Partial Volume EffectInfoSheet: - Artifacts - 
Case Studies, 
Reduction Index, 
etc.
 
The partial volume effect is the loss of contrast between two adjacent tissues in an image caused by insufficient resolution so that more than one tissue type occupies the same voxel (or pixel). That may induce a partial volume artifact, dependent on the size of the image voxel. If fat and water spins occupy the same voxel, their signals interfere destructively. A small amount of water signal may be eliminated by a larger lipid signal from the same voxel, resulting in a voxel that appears to contain only lipid. The partial volume effect is minimal with thin slice thickness and sufficiently high resolution, so that fat and water or other different structures are unlikely to occupy the same voxel.
mri safety guidance
Image Guidance
Take thinner slices, and higher resolution (smaller voxel), but remain this may result in poorer signal to noise ratio in the image.
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Partial Volume ArtifactInfoSheet: - Artifacts - 
Case Studies, 
Reduction Index, 
etc.MRI Resource Directory:
 - Artifacts -
 
Quick Overview
Artifact Information
NAME
Partial volume
DESCRIPTION
Loss of contrast between two adjacent tissues
REASON
Insufficient resolution
HELP
Thinner slices
The Partial Volume Artifact is caused by imaging voxel containing two different tissues and therefore possessing a signal average of both tissues.
mri safety guidance
Image Guidance
Take thinner slices (smaller voxel), but this may result in poorer signal to noise ratio in the image.

See Partial Volume Effect.
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• View the DATABASE results for 'Partial Volume Artifact' (4).Open this link in a new window

 
Further Reading:
  Basics:
MRI GLOSSARY
   by fonar.com    
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Breast MRIMRI Resource Directory:
 - Breast MRI -
 
(MR mammography) Magnetic resonance imaging of the breast is particularly useful in evaluation of newly diagnosed breast cancer, in women whose breast tissue is mammographically very dense and for screening in women with a high lifetime risk of breast cancer because of their family history or genetic disposition.
Breast MRI can be performed on all standard whole body magnets at a field strength of 0.5 T - 1.5 Tesla. Powerful gradient strengths over 15 mT/m will help to improve the balance between spatial resolution, scanning speed, and volume coverage. The use of a dedicated bilateral breast coil is obligatory.
Malignant lesions release angiogenic factors that increase local vessel density and vessel permeability. Breast cancer is detectable due to the strong enhancement in dynamic breast imaging that peaks early (about 1-2 min.) after contrast medium injection. If breast cancer is suspected, a breast biopsy may be necessary to secure the diagnosis.

See also Magnetic Resonance Imaging MRI, Biopsy and MR Guided Interventions.

Requirements in breast MRI procedures:
Both breasts must be measured without gaps.
Temporal resolution should be sufficient to allow early imaging after contrast agent with dynamic imaging every 60-120 sec.
For the best possible detection of enhancement fat signal should be eliminated either by image subtraction or by spectrally selective fat saturation.
Thin slices are necessary to assure absence of partial volume effects.
Imaging should be performed with a spatial resolution in plane less than 1 mm.

For Ultrasound Imaging (USI) see Breast Ultrasound at Medical-Ultrasound-Imaging.com.

See also the related poll result: 'MRI will have replaced 50% of x-ray exams by'
 
Images, Movies, Sliders:
 Breast MRI Images T2 And T1  Open this link in a new window
      
 Breast MRI Images T2 And T1 Pre - Post Contrast  Open this link in a new window
 Breast MRI Images T1 Pre - Post Contrast  Open this link in a new window
      
 
Radiology-tip.comradMammography,  Breast Imaging
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Medical-Ultrasound-Imaging.comBreast Ultrasound
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• View the DATABASE results for 'Breast MRI' (13).Open this link in a new window


• View the NEWS results for 'Breast MRI' (41).Open this link in a new window.
 
Further Reading:
  Basics:
New Screening Guidelines for Women at High Risk for Breast Cancer
Wednesday, 26 September 2007   by www.newswise.com    
CONTRAST-ENHANCED MRI OF THE BREAST(.pdf)
MRI Improves Breast Cancer Screening in Older BRCA Carriers
Monday, 5 January 2015   by www.cancernetwork.com    
  News & More:
Technology advances in breast cancer screenings lead to early diagnosis
Friday, 6 October 2023   by ksltv.com    
Are synthetic contrast-enhanced breast MRI images as good as the real thing?
Friday, 18 November 2022   by healthimaging.com    
Abbreviated breast MRI protocols not as cost-effective as promised, new study shows
Wednesday, 20 July 2022   by healthimaging.com    
Deep learning poised to improve breast cancer imaging
Thursday, 24 February 2022   by www.eurekalert.org    
Pre-Operative Breast MRI Can Help Identify Patients Likely to Experience Nipple-Sparing Mastectomy Risks
Wednesday, 7 April 2021   by www.diagnosticimaging.com    
Breast cancer screening recalls: simple MRI measurement could avoid 30% of biopsies
Monday, 1 March 2021   by www.eurekalert.org    
A Comparison of Methods for High-Spatial-Resolution Diffusion-weighted Imaging in Breast MRI
Tuesday, 25 August 2020   by pubs.rsna.org    
Pre-Operative Breast MRI Diagnoses More Cancers in Women with DCIS
Thursday, 9 July 2020   by www.diagnosticimaging.com    
Breast MRI and tumour biology predict axillary lymph node response to neoadjuvant chemotherapy for breast cancer
Thursday, 26 December 2019   by cancerimagingjournal.biomedcentral.com    
Breast MRI Coding Gets an Overhaul in 2019
Wednesday, 9 January 2019   by www.aapc.com    
How accurate are volumetric software programs when compared to breast MRI?
Thursday, 27 July 2017   by www.radiologybusiness.com    
Additional Breast Cancer Tumors Found on MRI After Mammography May Be Larger, More Aggressive
Wednesday, 9 December 2015   by www.oncologynurseadvisor.com    
Preoperative MRI May Overdiagnose Contralateral Breast Cancer
Wednesday, 2 December 2015   by www.cancertherapyadvisor.com    
BI-RADS and breast MRI useful in predicting malignancy
Wednesday, 30 May 2012   by www.oncologynurseadvisor.com    
MRI Resources 
Veterinary MRI - Education pool - Breast MRI - Manufacturers - Contrast Agents - Stimulator pool
 
Slice Thickness
 
(THK) The thickness of an imaging slice. As the slice profile may not be sharp edged, a criterion such as the distance between the points at half the sensitivity of the maximum (FWHM) or the equivalent rectangular width (the width of a rectangular slice profile with the same maximum height and same area) is used to determine thickness.
mri safety guidance
Image Guidance
For the image quality its important to choose the best fitting slice thickness for an examination. When a small item is entirely contained within the slice thickness with other tissue of differing signal intensity then the resulting signal displayed on the image is a combination of these two intensities. If the slice is the same thickness or thinner than the small structure, only that structures signal intensity is displayed on the image. This partial volume averaging effect explains the vanishing of fine details by choosing slices too large for the scanned object.

See also Partial Volume Artifact.
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• View the DATABASE results for 'Slice Thickness' (63).Open this link in a new window

 
Further Reading:
  Basics:
MRI Quality Control Program
   by www.simplyphysics.com    
  News & More:
Optimizing Musculoskeletal MR
   by rad.usuhs.mil    
MRI Resources 
Libraries - Universities - Stent - Functional MRI - Spine MRI - Breast MRI
 
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