title: [Method of correcting sensitivity nonuniformity using gaussian distribution on 3.0 Tesla abdominal MRI].
abstract: In the direction where the phased array coil used in parallel magnetic resonance imaging (MRI) is perpendicular to the arrangement, sensitivity falls significantly. Moreover, in a 3.0 tesla (3T) abdominal MRI, the quality of the image is reduced by changes in the relaxation time, reinforcement of the magnetic susceptibility effect, etc. In a 3T MRI, which has a high resonant frequency, the signal of the depths (central part) is reduced in the trunk part. SCIC, which is sensitivity correction processing, has inadequate correction processing, such as that edges are emphasized and the central part is corrected. Therefore, we used 3T with a Gaussian distribution. The uneven compensation processing for sensitivity of an abdomen MR image was considered. The correction processing consisted of the following methods. 1) The center of gravity of the domain of the human body in an abdomen MR image was calculated. 2) The correction coefficient map was created from the center of gravity using the Gaussian distribution. 3) The sensitivity correction image was created from the correction coefficient map and the original picture image. Using the Gaussian correction to process the image, the uniformity calculated using the NEMA method was improved significantly compared to the original image of a phantom. In a visual evaluation by radiologists, the uniformity was improved significantly using the Gaussian correction processing. Because of the homogeneous improvement of the abdomen image taken using 3T MRI, the Gaussian correction processing is considered to be a very useful technique.
authors: Department of Radiological Technology, Kanazawa Unviersity Hospital.
authors: Norio
authors: N
authors: Hayashi
authors: Tosiaki
authors: T
authors: Miyati
authors: Masako
authors: M
authors: Takanaga
authors: Naoki
authors: N
authors: Ohno
authors: Takashi
authors: T
authors: Hamaguchi
authors: Kazuto
authors: K
authors: Kozaka
authors: Shigeru
authors: S
authors: Sanada
authors: Tomoyuki
authors: T
authors: Yamamoto
authors: Osamu
authors: O
authors: Matsui
mesh_terms: D000005:Abdomen / Q000033:anatomy & histology; D000328:Adult; D000368:Aged; D000369:Aged, 80 and over; D005260:Female; D006801:Humans; D008279:Magnetic Resonance Imaging / Q000379:methods*; D008297:Male; D008875:Middle Aged; D016011:Normal Distribution; D019047:Phantoms, Imaging