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2 edition of K-space ranking for improved fat saturation in breast MRI. found in the catalog.

K-space ranking for improved fat saturation in breast MRI.

Kim Desmond

K-space ranking for improved fat saturation in breast MRI.

by Kim Desmond

  • 21 Want to read
  • 6 Currently reading

Published .
Written in English


About the Edition

A major limitation to achieving fast imaging with breast MRI is the necessity of a fat suppression process, since the lipid signal appears bright in MRI and may otherwise be misidentified as a lesion. The goal of this document is to thoroughly discuss current methods of fat suppression, and to investigate a means to reduce scan time while still achieving effective reduction in fat signal. A method is proposed by which a specific fat suppression technique, fat saturation, is applied less frequently to save time. Within the capacity of this method, the variable parameters are investigated and optimized in an attempt to produce images with the least fat contamination in the shortest period of time. This technique is demonstrated in phantoms and in-vivo, and compared with other fat suppression techniques upon which it has advanced.

The Physical Object
Pagination90 leaves.
Number of Pages90
ID Numbers
Open LibraryOL21218861M
ISBN 109780494273531

The specificity of MRI for fat necrosis may be improved by considering several variables. The degree of lipid cyst formation is a key factor; oil cysts with a thin rim of enhancement may be confirmed on non-fat-saturated images. Lesion location in the breast .   Drs. Elizabeth Morris and Laura Liberman, two rising stars in breast MRI from the Memorial Sloan-Kettering Cancer Center, edited this complete, superbly illustrated practical guide. The comprehensive text is written by contributors from the top cancer centers in the world. Introductory chapters are devoted to diagnosis and cover the basics of performing breast MRI exams, setting up a breast 5/5(1).

Example of Diagnostic Breast MRI Protocol 3D T1W bilateral multi-phase series, Gd contrast, fat sat 3-plane localizer Axial Bilateral T1W series 2D Sag Unilateral T2W fat sat bright fluid series Axial Post-Gd high resolution (x), fat sat, T1W series May include spectroscopy, diffusion-weighted imaging (DWI). Protocols vary between facilities. Improving MRI contrast: Imaging water and fat e-MRI. To present the different fat signal suppression techniques; Describe the advantages and disadvantages of STIR sequences, fat saturation, selective excitation of water; Specify the different families of contrast agents; Explain magnetization transfer and how it can improve background suppression.

Listed in the table below are the most common acquisition parameters for commonly used MRI pulse sequences (in msec). For a general introduction to these sequences please refer to MRI sequences (basic).. The specific parameters for any given study varies from one manufacturer to another, and from one imaging center to another. Mezrich R, A Perspective on k-Space: Radiology ; Paschal CB and Morris HD: k-space in the Clinic, JMRI 19(2) () k-space center occurs at middle of scan Scan Delay Contrast Injection The center of k-space occurs when the zero-strength phase-encoding gradients are applied.


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K-space ranking for improved fat saturation in breast MRI by Kim Desmond Download PDF EPUB FB2

Fat and Water Magnetic Resonance Imaging Thorsten A. Bley, MD,1,2 Oliver Wieben, PhD,3,4 Christopher J. Franc¸ois, MD,1 Jean H. Brittain, PhD,5 and Scott B. Reeder, MD, PhD1,3,4,6* A wide variety of fat suppression and water–fat separation methods are used to suppress fat signal and improve visu-alization of abnormalities.

This article Cited by: The spectral-spatial excitation could also be used as a 90° fat saturation pulse by exciting fat instead of water and then dephasing the fat. In this case, fat saturation can be performed independently over the two breasts, providing improved robustness to both B 0 and B 1 field by: 5.

If fat saturation is difficult, the patient must be instructed to remain very still during the examination so that the subtraction images will be interpretable.

Inhomogeneous fat saturation is a common problem and may be difficult to correct (, Fig 12a,). Inhomogeneous fat saturation can be due to field inhomogeneity, which may be improved by Cited by: Fat suppression is commonly used in magnetic resonance (MR) imaging to suppress the signal from adipose tissue or detect adipose tissue It can be applied to both T1 and T2 weighted sequences.

Due to short relaxation times, fat has a high signal on magnetic resonance images (MRI). It is also possible to save time by applying the Fat-Sat pulses at intervals less frequently than before every TR interval (e.g. Siemens' "Quick FatSat"). However, the time between Fat-Sat pulses cannot be extended longer than about msec, because significant longitudinal recovery of fat will occur in that interval due to its short T1.

Optimal K-Space Acquisition Reordering for Intermittent Fat Saturation in Breast MRI K. Desmond1, E. Ramsay2, D. Plewes1,2 1Medical Biophysics, University of Toronto, Toronto, Ontario, Canada, 2Imaging Research, Sunnybrook and Women’s Colle ge Health Sciences Centre, Toronto, Ontario, Canada Introduction Breast imaging is typically aided by fat.

MRI image appearance. The easiest way to identify T1 weighted fat saturated images is to look for adipose tissues in the body (e.g. subcutaneous fat and fat in bone marrow). Areas contain adipose tissues appear dark on T1 weighted fat saturated images. All the other characteristics of the T1 weighted fat saturated images remain the same as the.

Thesis title: K-Space ranking for improved fat saturation in Breast MRI. McMaster University. McMaster University Bachelor of Science () Mathematics and Physics (double major) Comparison of Biphasic and Reordered Fat Suppression for Dynamic Breast MRI Journal of Magnetic Resonance Imaging Jun Other authors.

See : Project Scientist at CAMH. : AAPM 2 Breast MRI Artifacts Common artifacts in breast MRI • Motion • Truncation artifacts • Out of volume wrapOut of volume wrap • SusceptibilitySusceptibility artifacts artifacts • Signal nonSignal non--uniformityuniformity • Poor or nonPoor or non- -uniform fat saturationuniform fat saturation Motion artifacts Occur in the phase encoding direction.

Example of Diagnostic Breast MRI Protocol 3D T1W bilateral multi-phase series, Gd contrast, fat sat 3-plane localizer Axial Bilateral T1W series 2D Sag Unilateral T2W fat sat bright fluid series Axial Post-Gd high resolution (x), fat sat, T1W series May include spectroscopy, diffusion-weighted imaging (DWI).

subcutaneous fat improved the contrast of the en-hanced mass to subcutaneous fat and that of breast parenchyma to subcutaneous fat. The enhanced le-sions were also heightened against the breast paren-chyma (Fig.

A remaining partially unsuppressed re-gion of subcutaneous fat was sometimes noted (Figs. 1 and 2). 1. Introduction. Contrast-enhanced MRI has significantly increased sensitivity to breast cancer, to 81–98%, but specificity has been lagging, with reports varying between 30% and 85%.Thus, alternative approaches to producing clinically useful contrast in magnetic resonance (MR) images are needed.

Breast magnetic resonance imaging (MRI) is recommended for women at high risk for breast cancer 1,2 and is increasingly being used for surgical planning 3 and treatment monitoring. 4,5 The current state of breast MRI focuses on collecting morphologic and dynamic information at a T magnetic field strength.

High-resolution images yield information regarding tumor. Breast MRI has become an essential examination for investigating the pathological breast. Over the past 10 years or so, a number of papers have described good practice in performing this examination.Breast MRI is the imaging of tumour angiogenesis, based on studying dynamic uptake of contrast agent in T1 imaging, which varies with the microvascularisation characteristics of breast.

improved fat saturation homogeneity, better quality of posterior anatomical structures, and decreased artifact severity. They also observed that the degree of saturation was higher in the Dixon technique although the difference to SS-FS did not reach Fat Suppression in Breast MRI.

Journal of Magnetic Resonance Imaging. ; To intra-individually compare the diagnostic image quality of Dixon and spectral fat suppression at 3 T. Fifty consecutive patients (mean age years) undergoing 3 T breast MRI were recruited for this prospective study.

The image protocol included pre-contrast and delayed post-contrast spectral and Dixon fat-suppressed T1w series. Two independent blinded readers compared.

A) Water Fat f B) f Fat-Sat Pulse Figure 3: Schematic spectrum of water and fat peaks and the positioning of a spectrally selective saturation (“fat-sat”) pulse over the primary fat peaks, Hz from the water peak, before (A) and after (B) the application of the fat-sat pulse. Short Tau Inversion Recovery (“STIR”).

e-mri, Fat saturation,Fat Sat, CHESS, SPIR, SPECIAL In the triglyceride molecules of fat, the electronic environment (shield) of the protons is not the same as that of water molecules. The 2 kinds of molecules have different proton resonance. Introduction. The importance of breast MRI.

Breast cancer is the second most common cancer in women in the US. It is also a leading cause of mortality among women. 1 A woman living in the US have a % (1 in 8) lifetime risk of being diagnosed with breast cancer.

Early detection as well as improvements in treatment have resulted in a reduction in breast cancer mortality. Such fat suppression artifacts are common in breast MRI at the edges of the breast near to the chest wall as seen in the superior region of the breast in Figure 6.

In all twenty cases in this study, areas with fat suppression failures of this nature in an area in the 3DPR-SSFP images corresponded to a failure in the same location in the FSE images.

The signal from fat sometimes obscures vessels on TOF MRA. Can fat suppression be used to improve image quality? Since time-of-flight MR images are T1-weighted and reformatted using a maximum intensity projection (MIP) method, high signal from fat. Fat suppression imaging 1. Fat suppression imaging By Roshan Shah MIT 3rd year 3rd batch 2.

Introduction Fat saturation is an MRI technique used to suppress the signal from normal adipose tissue. To suppress the fat signal for a given MR sequence a fat suppression module is typically inserted at the beginning of an otherwise normal MRI sequence.Fat suppression techniques in breast magnetic resonance imaging: a critical comparison and state of the art Chen Lin, Clark David Rogers, Shadie Majidi Department of Radiology and Imaging Science, Indiana University School of Medicine, Indianapolis, IN, USAAbstract: Robust and accurate fat suppression is highly desirable in breast magnetic resonance imaging (MRI.