title: [Study of gradient echo (GRE) Dixon image using low-field MRI scanner for examination of metastatic bone marrow tumors: comparison of double and single echo sequences].
abstract: We evaluated the gradient echo (GRE) Dixon method in metastatic bone tumors using a low-field MRI scanner (0.2 Tesla). This method is characterized by the double echo sequence of in-phase and opposed-phase. Studies were carried out on a phantom, 14 healthy volunteers, and clinical examples (33 vertebral bodies) using the T(1)-weighted spin echo, T(2)-weighted turbo spin echo, and GRE Dixon methods. Further, we obtained addition and subtraction images from the double echo sequence. In the clinical examples, the contrast-to-noise ratio (CNR) of the subtraction images (51.3+/-24.1) was significantly better than that of the T(1)-SE images (6.7+/-3.1, p<0.0001). For the examination of metastatic bone marrow tumors using a low-field MRI scanner (0.2 Tesla), subtraction images are thought to be the most effective.
authors.affiliation: Central Division of Radiology, Okayama University Hospital.
authors.forename: Seiichiro
authors.initials: S
authors.lastname: Ohno
authors.forename: Izumi
authors.initials: I
authors.lastname: Togami
authors.forename: Takuichi
authors.initials: T
authors.lastname: Kitayama
authors.forename: Yoshihiro
authors.initials: Y
authors.lastname: Ohkawa
authors.forename: Hisakazu
authors.initials: H
authors.lastname: Kobayashi
authors.forename: Noriaki
authors.initials: N
authors.lastname: Akagi
authors.forename: Eijiro
authors.initials: E
authors.lastname: Yamashita
authors.forename: Eitaro
authors.initials: E
authors.lastname: Nobuhara
authors.forename: Yasuki
authors.initials: Y
authors.lastname: Morioka
mesh_terms: D000328:Adult; D000368:Aged; D000369:Aged, 80 and over; D019046:Bone Marrow Neoplasms / Q000175:diagnosis* / Q000556:secondary*; D005260:Female; D006801:Humans; D007089:Image Enhancement / Q000379:methods*; D008279:Magnetic Resonance Imaging / Q000295:instrumentation / Q000379:methods*; D008297:Male; D008875:Middle Aged; D019047:Phantoms, Imaging