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C-1063 - Measurement of thin slice thickness in MRI using an improved wedge method

T. KANAZAWA, M. Ohkubo, T. Kondo; Niigata/JP Type: Scientific Exhibit
Area of Interests: MR physics, Radiation physics
Imaging Technique: MR
Procedure: Physics
Special Focus: Quality assurance
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Aims and objectives: In three-dimensional (3D) magnetic resonance imaging (MRI), the slice thickness is generally set thinner than in two-dimensional (2D) imaging. In particular, when using cisternography sequences, such as 3D constructive interference in steady state (CISS), the slice thickness is usually reduced to &l[...]

Methods and materials: All MR imaging was performed on a 3 T scanner (MAGNETOM Verio: Siemens, Erlangen, Germany) using a 12-channel array head coil. Using the slab method, slice thickness was measured using a slab phantom (Philips Medical Systems, Vantaa, Finland) (Fig. 1a) [3-5]. In the wedge method and the improved wed[...]

Results: 5 mm slice thickness An example result using the improved wedge method is shown in Fig. 5. The fitted curve shows excellent agreement with the ERF. Slice thicknesses obtained for each profile by the slab, wedge, and improved wedge methods are shown in Fig. 6. The wedge method showed a larger varianc[...]

Conclusion: The ERF in the standard wedge method, which is the signal intensity profile before performing the differentiation, has sufficiently high SNR for general purposes, because images applied to measurements of slice thickness are acquired so that they have a high enough SNR to obtain accurate profile dat[...]

Personal information: Tsutom Kanazawa MS, Department of Radiology, Niigata University Hospital, Niigata, Japan   Tatsuya Kondo MS, Department of Radiology, Niigata University Hospital, Niigata, Japan   Masaki Ohkubo PhD, Graduate School of Health Sciences, Niigata University, Niigata, Japan

References: Mathias K, Gemot S, Eberhard U, Robert S, Karsten S, Stefan Z. Three-dimensional constructive interference in steady-state magnetic resonance imaging in obstructive hydrocephalus: relevance for endoscopic third ventriculostomy and clinical results. J Neurosurg, 2008;109(11): 931-938. Levent T, Peter[...]

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