Norio Hayashi¹, Akio Ogura¹, Atsuya Fuju², Tomokazu Takeuchi³, Yusuke Sato⁴, Maiko Hashimoto⁵, and Masahiko Takahashi^5
1Radiological Technology, Gunma Prefectural College of Health Sciences, Maebashi, Japan, ²Radiology, Kiryu Kosei General Hospital, Kiryu, Japan, ³Graduate School of Radiological Technology, Gunma Prefectural College of Health Sciences, Maebashi, Japan, ⁴Radiology, Gunma University Hospital, Maebashi, Japan, ⁵Isesaki Municipal Hospital, Isesaki, Japan

The purpose of this study was to evaluate the attraction force and image artifacts of 17 different leave-on powdered hair thickeners from 7 vendors. Displacement force was measured by the ASTM F2052, and MRI artifact was estimated by the ASTM F2052. There were some types of leave-on powdered hair thickener that do contain magnetic materials. They were highly susceptible to mechanical effects and will cause more image artifacts, so it must be removed before the examination.

CHIKARA NODA¹, Chia Ying Liu², Jason Ortman¹, Bharath Venkatesh Ambale³, Webster Stayman⁴, Yoshimori Kassai⁵, and Joao A.C. Lima^1
1Cardiology, Johns Hopkins University, Baltimore, MD, United States, ²Canon Medical Research, Cleveland, OH, United States, ³Radiology, Johns Hopkins University, Baltimore, MD, United States, ⁴Biomedical Engineering, Johns Hopkins University, Baltimore, MD, United States, ⁵Canon Medical Systems Corporation, Otawara, Japan

3D radial Ultrashort echo time sequence is a promising technique for lung imaging but the protocol has not been optimized. We examined the parameters including number of trajectories and flip angles using a lung phantom. In-vivo images were obtained and evaluated based on the parameters optimized in the phantom study. UTE acquisition in axial rather than coronal direction produced better quality of images. Breath holding acquisition may be an option in case patients cannot tolerate long scan time.

Hannah Bergman¹, Alaine Berry¹, and Ben Statton^1
1MRC, Imperial College, London, United Kingdom

The dark blood late gadolinium enhancement technique has shown improved delineation of sub-endocardial infarcts by nulling both the blood pool and the normal myocardium. Optimal image quality and consistency depends on a number of factors, including gadolinium dose and the delay time before imaging. In this study we sought to determine whether gadolinium dose and delay time before imaging, affected the nulling of the blood pool and myocardium.

Wakiko Tani¹, Yutaka Katayama², Tomoaki Yamakawa¹, Shintaro Horii¹, Ryuji Shimada¹, Yuichiro Somiya¹, and Akiko Kusaka^1
1Center for Radiology and Radiation Oncology, Kobe University Hospital, Kobe, Japan, ²Division of Radiological Technology, Osaka City University Hospital, Osaka, Japan

No-reference image quality assessment (NR-IQA) model called Blind/Referenceless Image Spatial Quality Evaluator (BRISQUE) is one of the objective evaluations of images. To investigate whether BRISQUE can be used to quantify artifacts on MRI images, we compared the BRISQUE score with the visual score. The BRISQUE score was reduced and the visual score was improved by increasing bandwidths from 51 kHz to 307 kHz. Pearson correlation coefficient was 0.7576 and BRISQUE score was associated with the visual score (P < .05). This study suggests that BRISQUE can quantitatively evaluate metal artifacts.

Yuichiro Somiya¹, Yoshiko Ueno², Shintaro Horii¹, Ryuji Shimada¹, Keitaro Sofue², Naoki Yoshida¹, Wakiko Tani¹, Akiko Kusaka¹, and Takamichi Murakami^2
1Center of Radiology and Radiation Oncology, kobe university hospital, kobe, Japan, ²Department of Radiology, Kobe University Graduate School of Medicine, kobe, Japan

This study evaluated the effect of denoising level on signal intensity (SI) and apparent diffusion coefficient (ADC) values of diffusion-weighted imaging using the single-shot turbo spin-echo sequence (TSE-DWI) with compressed sensing (CS) in cervical cancer. As the denoising level increased, the SI of cervical cancer tended to decrease, and the ADC values tended to increase on TSE-DWI with CS. Nevertheless, at each denoising level, the ADC values of cervical cancer were significantly lower than those of normal uterine cervix.

Christine Mancini¹, W. Patricia Bandettini¹, Peter Kellman¹, Hui Xue¹, and Adrienne E. Campbell-Washburn^1
1NHLBI, National Institutes of Health, Bethesda, MD, United States

This abstract is a comparison of native and post contrast T1 mapping and ECV of the myocardium using a conventional 1.5T scanner and a high-performance 0.55T scanner.

Yuichi Suzuki¹, Tsuyoshi Ueyama¹, Takahiro Iwasaki¹, Jiro Sato¹, Hideyuki Iwanaga¹, and Osamu Abe^1
1Department of Radiology, THe University of Tokyo Hospital, Tokyo, Japan

We investigated the effect of image quality deterioration and data shortage of DWI on automatic white matter bundle segmentation. We set the gold standard (GS) data without SMS and MPG = 64 axes. Two kinds of comparisons were made in comparison with GS data. The one was with/without the SMS, and the other eliminated some acquired data from GS. We analyze the data only from the first 8, 16, 32 and 48 axes of MPG in the GS. There was almost no difference between SMS of 2 and 3. For MPG, 16 axes provided results comparable to the GS.

Toshiya Akatsu¹, Haruyuki Fukuchi^2,3,4, Kei Fukuzawa⁴, Nao Takano¹, Yutaka Ikenouchi³, Michimasa Suzuki³, Kohji Kamagata³, Akihiko Wada³, Osamu Abe², and Shigeki Aoki^3
1Department of Radiology, Juntendo University Hospital, Tokyo, Japan, ²Department of Radiology, Graduate School of Medicine, University of Tokyo, Tokyo, Japan, ³Department of Radiology, Juntendo University Graduate School of Medicine, Tokyo, Japan, ⁴Department of Radiology, Toranomon Hospital, Tokyo, Japan

We implemented the new Variable TI method to multi-phase ASL 4D UTE-MRA in order to improve the visibility of hemodynamic flow. We performed a numerical simulation and a phantom study to find the optimized condition. It was found that a 50 % reduction of TI steps increases 50 % of signal from the flow volume without impairment of structural information.

Olga V Fadeeva Da Costa^1,2, Shah Islam^2,3, Mark M Boubnovski³, Eric Aboagye³, and Adam D Waldman^4,5
1Department of Surgery & Cancer, Cancer Imaging Centre, Hammersmith Campus, Imperial College, London, United Kingdom, ²Imaging Department, MRI Unit, Hammersmith Hospital, Imperial College Healthcare NHS Trust, London, United Kingdom, ³Department Of Surgery & Cancer, Cancer Imaging Centre, Hammersmith Campus, Imperial College, London, United Kingdom, ⁴Department of Brain Sciences, Hammersmith Campus, Imperial College, London, United Kingdom, ⁵Centre for Clinical Brain Sciences, University of Edinburgh, Edinburgh, United Kingdom

Glioblastoma (GBM) account for ~70% of adult primary brain tumours.  Interrogation of post-operative disease residuum and peritumoral microenvironment is necessary for imaging biomarker development. This involves accurate delineation and segmentation of these particular regions of interest.  A total of 35 post-operative T1 post contrast and T2 FLAIR MRI’s underwent segmentation by two independent readers. There was poor inter reader reproducibility in segmentations of disease residuum on post contrast T1 images, although this improved was higher for on segmentation of abnormal regions on FLAIR.  Strong intra reader reproducibility suggests systematic error effects in identifying regions of interest. 

Hiroyuki Takashima^1,2, Rui Imamura¹, Tsuneo Takebayashi³, Yasuhisa Abe³, Izaya Ogon², Hiroshi Oguma³, Yoshihiro Akatsuka¹, and Toshihiko Yamashita^2
1Division of Radiology and Nuclear Medicine, Sapporo Medical University Hospital, Sapporo, Japan, ²Department of Orthopaedic Surgery, Sapporo Medical University School of Medicine, Sapporo, Japan, ³Department of Orthopaedic Surgery, Sapporo Maruyama Orthopedic Hospital, Sapporo, Japan

The parameters of vertebral fracture (VF) and without fracture using intravoxel incoherent motion (IVIM) were analyzed. In addition, the usefulness of using IVIM for VF was investigated. The subjects of this study were 52 patients with VF in the acute phase. As a result, the ADC, D, and f of VF were significantly higher than without fracture. Meanwhile, the D* of VF were significantly lower than without fracture. In the future, new findings may be obtained by analyzing the IVIM parameters and VF prognosis.

Kristina Mary Pelkola^1,2, Onur Afacan^1,2, Tess E. Wallace^1,2, Pauline Connaughton¹, Jenna McKay¹, Joseph Zmuda¹, Camilo Jaimes¹, and Simon K. Warfield^1,2
1Radiology, Boston Children's Hospital, Boston, MA, United States, ²Computational Radiology Laboratory, Boston Children's Hospital, Boston, MA, United States

Magnetic Resonance Imaging (MRI) can be challenging for pediatric patients due to the large tunnel and loud noises. Anxiety and fear can be sparked causing them to be uncooperative and unable to hold still [1,2]. These exams are often plagued with motion artifacts resulting in poor diagnostic image quality and a challenge for Radiologists to interpret [3]. The administration of sedation or anesthesia is costly, potentially harmful, and doesn't eliminate motion artifacts due to breathing and uncontrollable muscle spasms [4]. There is an unmet need for alternative methods to enable diagnostic imaging exams in the presence of motion.  

Xin Dong^1,2, Arnold Ng^3,4, Sharon Watson⁵, Harish Sharma⁵, Graham Galloway^1,2,6, and Margot Lehman^5
1Queensland University of Technology, Brisbane, Australia, ²Translational Research Institute, Woolloongabba, Australia, ³Cardiology, Princess Alexandra Hospital, Brisbane, Australia, ⁴University of New South Wales, Sydney, Australia, ⁵Radiation Oncology, Princess Alexandra Hospital, Brisbane, Australia, ⁶The University of Queensland, St Lucia, Australia

The usefulness of T1 and ECV mappings in the context of radiation cardiotoxicity has yet to be studied. In the current study, we conducted a longitudinal CMR study on 30 females with left-sided breast cancer before and after Deep Inspiration Breast Hold (DIBH) radiotherapy (RT). The results showed patients who were treated with DIBH RT had no CMR detectable functional or structural myocardial changes 6 months following RT treatment. This has important implications on the long-term cardiac health of the growing number of women who are surviving or living with breast cancer.

Kevin Epperson¹, Karla Epperson¹, Garry Gold², and Feliks Kogan^3
1Radiology School of Medicine, Stanford University, Stanford, CA, United States, ²Radiology, Stanford Univeristy, Stanford, CA, United States, ³Radiology - SOM, Stanford Univeristy, Stanford, CA, United States

Diagnostic MRI scanning of the knee at 3T offers multiple contrasts and definition of anatomical structures, presenting pathology, and allows quantitative performance methods.  MRI scanning at 7T of the knee presents challenges, however the ultra high field system offers improved resolution and SNR for visualization of small morphological changes and translation of quantitative methods when these challenges are satisfied.