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The apparent diffusion coefficient (ADC) values are calculated by using signal intensity in diffusion-weighted images (DWIs) with two or more different b-value. Therefore, the signal to noise ratio (SNR) of DWI with higher b-value may have a big influence on the measured ADC value. We examined the influence of the imaging parameters on the calculated ADC(More)
An investigation on instrumentation of birth weight in obstetric facilities was made in the northern part of Fukuoka Prefecture from March 1989 to January 1991. A distribution of 3000 cases from 100 facilities was analyzed for the purpose of clarifying the reliability of the data. The following results were obtained. 1) Birth weights measured by analogue(More)
When measuring the signal-to-noise ratio (SNR) of an image the used parallel magnetic resonance imaging, it was confirmed that there was a problem in the application of past SNR measurement. With the method of measuring the noise from the background signal, SNR with parallel imaging was higher than that without parallel imaging. In the subtraction method(More)
OBJECTIVE The aim of the study was to investigate the causes of apparent diffusion coefficient (ADC) measurement errors and to determine the optimal scanning parameters that are independent of the field strength and vendors of the magnetic resonance (MR) system. MATERIALS AND METHODS Brain MR images of 10 healthy volunteers were scanned using 6 MR(More)
Using the birth weight frequency table with 500 g intervals and 10 classes (less than or equal to 999, 1000-1499,..., 4500-4999, 5000 less than or equal to) as a standard table (0 method) and creating 8 kinds of modified frequency tables (a,..., h method) by integrating the lower and/or upper classes in the standard table into neighboring classes, we(More)
The definitional equation of the distortion of echo planar imaging(EPI)was examined. We compared measured values with calculated values by using the definitional equation of the chemical shift of the EPI method that first composed the diffusion-weighted image, and examined the possibility of applying it to the distortion. The results showed that the(More)
In magnetic resonance imaging (MRI) examination of the patients with the cochlear implant, only limited data have a mention for safety information in the instruction manual supplied by the manufacturers. Therefore, imaging operators require more detailed safety information for implant device. We conducted detailed examination about displacement force,(More)
3. Patient care in interventional radiology for safety: nurse perspective National Cancer Center Nozomi Asai 4. New technologies for ultrasound guided ablation therapies-Fusion imaging and needle navigation system-Tokyo Medical Univ. Fuminori Moriyasu 5. Interventional radiology with a new tracking navigation imaging system of cone-beam CT angiography Kinki(More)
In many clinical imaging procedures using arrays of multiple receiver coils, a uniform sensitivity process is performed using the sensitivity distribution from the body coil. This causes the noise to be uneven, and background noise cannot be used when measuring the signal-to-noise ratio (SNR). The SNR of clinical images with sensitivity correction using(More)
We evaluated the fitting scan technique for CE-3dMRDSA, and found common ground that determines spatial resolution and time resolution (slab thickness and partition number). We also examined the relation between appearance and time resolution (volume of contrast medium and injection speed). To obtain good image contrast, the volume of contrast medium needs(More)