Native myocardial T mapping using inversion recovery T-weighted turbo field echo sequence.

This study proposes the use of the inversion recovery T-weighted turbo field echo (IR-TTFE) sequence for myocardial T mapping and compares the results obtained with those of the modified Look-Locker inversion recovery (MOLLI) method for accuracy, precision, and reproducibility. A phantom containing seven vials with different T values was imaged, thereby comparing the T measurements between the inversion recovery spin-echo (IR-SE) technique, MOLLI, and the IR-TTFE. The accuracy, precision, and reproducibility of the T-mapping sequences were analyzed in a phantom study.

Deep learning-based attenuation correction method in Tc-GSA SPECT/CT hepatic imaging: a phantom study.

This study aimed to evaluate a deep learning-based attenuation correction (AC) method to generate pseudo-computed tomography (CT) images from non-AC single-photon emission computed tomography images (SPECT) for AC in Tc-galactosyl human albumin diethylenetriamine pentaacetic acid (GSA) scintigraphy and to reduce patient dosage. A cycle-consistent generative network (CycleGAN) model was used to generate pseudo-CT images. The training datasets comprised approximately 850 liver phantom images obtained from SPECT and real CT images.

3D phase-sensitive inversion recovery sequence for intracranial vertebrobasilar artery dissection.

Background: T1-weighted 3D turbo spin echo (T1W-3D-TSE) sequences with variable refocusing flip angle are commonly used to diagnose intracranial vertebrobasilar artery dissection (iVAD). However, magnetic susceptibility artifacts of the cavernous sinus may cause loss of the basilar and vertebral arteries. This study investigated the effectiveness of a 3D phase-sensitive inversion recovery (3D-PSIR) sequence in reducing magnetic susceptibility artifacts in the cavernous sinus, and its imaging findings for iVAD.

Image Quality Assessment of Deep Learning Image Reconstruction in Torso Computed Tomography Using Tube Current Modulation.

Novel deep learning image reconstruction (DLIR) reportedly changes the image quality characteristics based on object contrast and image noise. In clinical practice, computed tomography image noise is usually controlled by tube current modulation (TCM) to accommodate changes in object size. This study aimed to evaluate the image quality characteristics of DLIR for different object sizes when the in-plane noise was controlled by TCM.

Case Report: COVID-19 Pandemic Exacerbates Eating Disorder by Social and Intrafamilial Isolation.

The coronavirus disease-2019 (COVID-19) pandemic has increased the stress levels of children and their parents and diagnoses of eating disorders (EDs), irritable bowel syndrome, migraines, tension headaches, orthostatic dysregulation, and/or school refusal has increased among children. We present a case of a nine-year old girl, which rapidly worsened due to stress and isolation related to the COVID-19 pandemic. The patient's father noted her rapid weight loss due to poor oral intake.

A Case of Type 2 Diabetes Mellitus With t(6;7)(q24;q31.2) Balanced Translocation.

Most balanced translocations do not involve any gain or loss of genetic material, and individuals harboring these translocations remain clinically asymptomatic. Nevertheless, balanced translocations have reportedly been associated with several diseases. Here, we present the case of a 12-year-old boy with type 2 diabetes mellitus that could not be explained only by obesity; the patient harbored a balanced translocation (46,XY t(6;7)(q24;q31.

Secondary Pseudohypoaldosteronism Associated With Mild Hydronephrosis in a Newborn.

Neonatal hyponatremia with hyperkalemia is a rare but potentially life-threatening occurrence. Aldosterone deficiency secondary to congenital adrenal hyperplasia (CAH) is often suspected in these cases, although it is not easy to accurately diagnose it initially. We report the case of a 12-day-old female infant presenting with poor sucking, hyperkalemia, and hyponatremia.

Image Evaluation of Free-breathing Navigator Echo and Triggered Cardiac-gated Delayed Myocardial Enhancement Magnetic Resonance Imaging in Sedated Infants.

We validated a navigator-echo-triggered sequence that drives magnetization before cardiac-gated inversion recovery T1 turbo field echo acquisition, in the sedated free-breathing pediatric population. Cardiac magnetic resonance imaging was performed on sedated infants with single ventricle. We calculated the signal-to-noise ratios and contrast-to-noise ratios of 2 groups of images obtained using respiratory triggering with and without navigator echo.

[Computerized estimation of a percent glandular tissue composition in computed radiography mammography].

Measurement of a percent glandular tissue composition (%GTC) is important in terms of the estimation of individual patient exposure dose and the prediction of malignancy, and thus a number of reports for estimating %GTC by use of a mammogram have been published. In this study, we propose a method for estimating individual %GTC by use of computed radiography (CR) mammograms. By employing breast-equivalent phantoms that are able to create breast phantom images with various combinations of fat and glandular tissue, as well as the thickness of whole breast, we determined a reference table for converting an each pixel value on CR mammography to the glandular tissue ratio.

High spatial resolution MRA of renal arteries using contrast behavior between fat and water during transient phase before reaching a steady state.

Purpose: Our aim is high spatial resolution imaging of maximum intensity projection (MIP) images in renal magnetic resonance angiography (MRA) by constructing a protocol for acquiring three-dimensional volume data with isotropic voxels.

Materials And Methods: We eliminated water-selective excitation (WATS) and utilized effective contrast behavior between fat and water before reaching a steady state-that is, during the transient phase-to cover fat suppression by WATS. In a phantom study, the optimal flip angle was investigated under the "low-high Y" profile order using distilled water and baby oil to construct a protocol with isotropic voxels.

An epidemiological study of the susceptibility and frequency of multiple-drug-resistant strains of Pseudomonas aeruginosa isolated at medical institutes nationwide in Japan.

The susceptibility of 3233 strains of Pseudomonas aeruginosa, isolated primarily in 2001, as agents of infection at 37 medical institutes with various specialties in seven regions of Japan (ranging from Hokkaido to Kyushu/Okinawa), to 18 antipseudomonal agents known to be active against P. aeruginosa was evaluated, in accordance with the National Committee for Clinical Laboratory Standards (NCCLS) guidelines. Of the 18 antipseudomonal agents, including some combinations of beta-lactamase inhibitors and antibacterial agents, ciprofloxacin had the lowest minimum inhibitory concentration (MIC)(50) (0.

[Accuracy of measurement of radiochromic film density for high-energy X-rays].

Radiochromic film (RC-film) is of great interest as a film-type dosimeter for radiation oncology applications. We present a two-dimensional image-based evaluation of the measurement accuracy of a commercial RC-film product (Gafchromic MD-55-2 film, ISP TECHNOLOGIES, Inc.) by using a commercial Laser Densitometer (Model 1710, Computerized Medical Systems, Inc.

Delayed cell cycle progression in human lymphoblastoid cells after exposure to high-LET radiation correlates with extremely localized DNA damage.

To compare the genotoxic effects of high-LET ionizing radiation to those of low-LET radiation, we investigated the responses of human lymphoblastoid cells to DNA damage TK6 after treatment with either low-LET X rays or high-LET iron ions (1000 keV/microm). A highly localized distribution of gammaH2AX/RAD51 foci was observed in the nuclei of cells irradiated with iron ions, in sharp contrast to cells exposed to X rays, where the distribution of foci was much more uniform. This implied the occurrence of a relatively high frequency of closely spaced double-strand breaks, i.