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Ian David Langenfeld RT.(R)(MR)(MRSO)¹, Jenna Kleinow RT.(R)(MR)(MRSO)¹, Brian Burkett M.D., M.P.H.¹, Paul Farnsworth D.O.¹, Garima Suman, M.D. ¹, Steven Messina, M.D.¹, and Joel Felmlee Ph.D.^1
1Radiology, Mayo Clinic, Rochester, MN, United States

This study assesses the use of acoustic noise reduction (ANR) techniques as well as utilizing machine learning in conjunction with ANR, in order to preserve image quality and limit acquisition time. The standard sequences in a brain without contrast exam were tested to determine decibel (dBA) level, image quality, as well as the scanned volunteers' semiquantitative "loudness" scores.

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YASUO TAKATSU^1,2, Masafumi Nakamura^2,3, Yuichi Suzuki⁴, and Tosiaki Miyati^2
1Molecular Imaging, School of Medical Sciences, Fujita Health University, Toyoake, Japan, ²Division of Health Sciences, Graduate School of Medical Sciences, Kanazawa University, Kanazawa, Japan, ³Department of Radiology, Otsu City Hospital, Otsu, Japan, ⁴Department of Radiology, The University of Tokyo Hospital, Tokyo, Japan

The position dependence of the ADC in magnetic resonance imaging (MRI) by EPI- and TSE-DWI was assessed using phantoms based on the relationship between SNR and B₁ maps. ADC decreased with distance from the center of the magnetic field for both EPI-DWI and TSE-DWI. The Pearson correlation coefficient between ADC and FA was strong and more significant than between ADC and SNR. ADC depends on the slice position and decreases with an increase in distance from the magnetic field center. Caution should be taken when comparing and quantitatively evaluating the ADC at sites shifted in the long-axis direction.

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Yoshihiro Akatsuka¹, Atsushi Teramoto², Yasutaka Murahashi², Katsunori Takahashi², Rui Imamura¹, Tomoaki Kamiya², and Kota Watanabe^3
1Division of Radiology and Nuclear Medicine, Sapporo Medical University Hospital, Sapporo, Japan, ²Department of Orthopedic Surgery, Sapporo Medical University School of Medicine, Sapporo, Japan, ³Second Division of Physical Therapy, Sapporo Medical University School of Health Sciences, Sapporo, Japan

This study investigated the feasibility of quantitative assessment of anterior talofibular ligament (ATFL) quality in chronic ankle instability (CAI) using T2* relaxation time. A prediction equation for the normal ATFL reference value was calculated in healthy volunteers. The ratio between the normal reference value and the patient's T2* value showed a significant positive correlation with the talar tilt angle on stress radiograph. There was also increasing trend in T2* values for poor ligament quality in the arthroscopic findings. T2* relaxation times are promising for quantitatively assessing ATFL quality preoperatively.
 

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Vahid Ravanfar¹, Heather Daniel¹, Emma Bahrros¹, Rupsa Bhattacharjee¹, Maya Aslam¹, Patrick D. Koon², Mehdi Khalighi³, and Dr. Matthew Bucknor^1
1Radiology and Biomedical Imaging, University of California San Francisco, San Francisco, CA, United States, ²GE Healthcare, Waukesha, WI, United States, ³Rad/PET/MRI Metabolic Service Center, Stanford University, Palo Alto, CA, United States

When acquiring fat suppression sequences, active shimming can be used to reduce magnetic field inhomogeneities which are inversely related to image quality and cause image artifact. Active shimming improves image quality by optimizing the homogeneity on an individual patient basis to optimize the final shimming and directly, the resulting image quality.

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Sajith Rajamani¹, Ashok Kumar Reddy¹, Nitin Jain¹, Rajdeep Das¹, Rajagopalan Sundaresan¹, Jeremy Heinlein², Harsh Kumar Agarwal¹, Arnaud Guidon², Sudhir Ramanna¹, and Ramesh Venkatesan^1
1GE Healthcare, Bangalore, India, ²GE Healthcare, Milwauke, WI, United States

DWI is an important sequence for the diagnosis of liver lesions and to monitor the treatment response in patients undergoing therapies for hepatic malignancies [1]. But it is difficult to place the anterior abdomen coil for obese patients in non-wide bore MRI systems because of a potential chance of pinching the coil between patient and the bore. This is a limiting factor for the adoption of liver DWI MRI in clinical practice [2]. As a solution, we are proposing Dual Shots DWI with under-sampling across shots using volume coil located inside the magnet.

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Yuwei Chen¹ and Nian Liu^1
1North Sichuan Medical College, Nanchong, China

Objective: Explore the characteristics of brain white matter network in non-suicidal self-injury patients.

Methods: The diffusion tensor imaging were prospectively collected form 30 adolescent patients with NSSI. The data was processed by software. Two independent sample t-test and partial correlation analysis were used to compare network metrics and clinical symptoms.

Results: There was no significant difference in global network metrics, but there were significant differences in nodal network metrics, including nodal efficiency, nodal degree centrality and nodal shortest path length (all P＜0.05).

Conclusion: These finding provide new insights into the neural circuit mechanism of adolescent NSSI patients.

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YuLong Qi¹, GuanXun Cheng², and ChuanLi Cheng^3
1Medical Imaging Department, Peking University ShenZhen Hospital, ShenZhen, China, ²Peking University ShenZhen Hospital, ShenZhen, China, ³Shenzhen Institutes of Advanced Technology(SIAT), ShenZhen, China

The study explores the correlation between fat distribution characteristics and traditional anthropometric indexes.37 volunteers were scanned with whole-body transverse MR PDFF(Proton Density Fat Fraction) images, covering from neck to knee.In the fat distribution characteristics based on magnetic resonance whole-body imaging, only the proportion of whole-body fat volume showed moderate correlation with traditional ergonomic indexes, and other indexes had low correlation with ergonomic indexes.the correlation between the whole-body fat distribution characteristics based on PDFF image and body mass index (BMI) ,waist to hip ratio (WHR) was analyzed.  Different from the anthropometric indexes, the distribution characteristics of body fat show great differences between sexes.

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Hiroyuki Hoshiko¹, Masaaki Ninomiya¹, Akiyoshi Yamamoto¹, Seigo Yoshida¹, and Katsumi Nakamura^1
1Tobata Kyouritsu Hospital, Kitakyusyu,Fukuoka, Japan

We investigated the psychological state of patients in an MRI examination room equipped with LED-backlit photoprints (SKY LIGHT). We surveyed patients who had completed their examinations in the room about their impressions of the room. The patients' responses were categorized into three types based on their words: positive, negative, and indifferent, and the percentages were calculated. 74.5% of the patients had positive impressions of the rooms after the examination. In conclusion, the results suggest that MRI rooms with SKY LIGHT can give positive impressions to patients.

ABDUL QAYOOM RAKHSHANI¹ and Uzama Azmat^2
1RADIOLOGY۔ MRI, DOW UNIVERSITY OF HEALTH SCIENCES KARACHI, Karachi, Pakistan, ²Radiology, MMI Karachi, Karachi, Pakistan

To assess the yield of Incidence of Meniscal tears and associated with osteoarthritis on MRI Knee joint non-contrast enhanced.
A cross Sectional study was conducted at department of Radiology MRI Section MMI HOSPITAL Karachi. From January 2019 to February 2020. All patients came for MRI Examination; we assess MRI Knee Joints Non-Contrast Enhanced for Association of meniscal tears with Osteoarthritis on Knee Joints. The data was analyzed for demographic characteristics, referring clinician and Site, Grade and type of tears with final diagnosis.

Pradeep Singh Negi^1,2, Shashi Bhushan Mehta^1,2, and Amarnath Jena^1,2
1Department of Molecular Imaging and Nuclear Medicine, PET SUITE: Indraprastha Apollo Hospitals and House of Diagnostics, Delhi, India, ²Department of Physics, Vivekananda Global University, Jaipur, India

¹⁸F-FDG PET/MRI can be helpful for diagnosing, staging, restaging, and assessing the post therapeutic response in breast cancer patients. Metabolic tumor volume (MTV) may be more reliable but volumetric assessments of FDG PET needs correct tumor segmentation. We have proposed hand craft fuzzy rule base system to improve tumor volume by using simultaneous PET/MRI for accurate MTV estimation. Four breast cancer patients underwent FDG PET/MRI for staging purpose. Pathological tumor volume was compared with MRI volume, K^trans volume and MTV computed by hand craft fuzzy rule and the results showed fuzzified tumor volume were more accurate compared with other volumes.

Yang Sun^1
1First Hospital of Jilin University, ChangChun, China

Clinical feasibility study of AI accelerateed STAGE

Moreno Zanardo¹, Luigi Asmundo¹, Davide Capra², Anna Colarieti³, Andrea Cozzi⁴, Massimo Cressoni⁴, Veronica Magni¹, Caterina Beatrice Monti², and Francesco Sardanelli^5
1Università degli Studi di Milano, Milano, Italy, ²Università degli Studi di Milano, Milan, Italy, ³IRCCS Policliico San Donato, Milano, Italy, ⁴IRCCS Policlinico San Donato, Milano, Italy, ⁵Università degli Studi di Milano - IRCCS Policlinico San Donato, Milan, Italy

In order to provide preliminary data about the potential reduction of contrast agents’ residuals in hospital wastewater and to estimate contrast agent excretion in the first hour after administration, the GREENWATER study aims to prospectively monitor over a 12-months timeframe the quantity of retrievable ICAs and GBCAs from urine collected from outpatients within an hour from contrast agent administration, also evaluating the influence of patient age and sex and the overall rate of acceptance to participate to the study. Our current purpose is to provide a first glance on this initial experience.

JinRui Zhang^1
1Chongqing Emergency Medical Center, Chongqing, China

Compared with DTI (diffusion tensor imaging), DSI(diffusion spectrum imaging) has more accurate spatial resolution ability in mTBI(mild traumatic brain injury), and DSI-based fiber tracking technology has become an important tool for medium scale (mesocale) structural elucidation, building a bridge between microscopic and macroscopic scales, which provides the possibility for further exploration and integration of multi-scale analytical studies at the cellular level as well as at the subcellular level.