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• Clinical Article •
Study of optimizing MRI protocols for eyeball
CHEN Qing-hua  WANG Zhen-chang  XIAN Jun-fang 

DOI:10.3969/j.issn.1674-8034.2012.05.002.


[Abstract] Objective: To optimize the MRI protocols for eyeball.Materials and Methods: FSE T1WI, T2WI (FOV was 18 cm×8 cm, 10 cm×10 cm, or 8 cm×8 cm, slice thickness was 4.0 mm, 3.0 mm, 2.0 mm respectively) and FSPGR (FOV was 18 cm×18 cm, 10 cm×10 cm, 8 cm×8 cm, slice thickness was 3.2 mm, 2.8 mm, 2.4 mm respectively) were performed with eye surface coil to optimize the protocols, then axial FSE T2WI was performed with head coil in 10 healthy volunteers, SNR, CNR and spatial resolution were computed with statistical treatment.Results: (1) For phantom, spatial resolution were 0.80 mm, 0.45 mm, 0.36 mm, when FOV were 18 cm×18 cm, 10 cm×10 cm, 8 cm×8 cm respectively with slice thickness/interval 4.0 mm/0.5 mm, matrix 288×224, NEX 2, the SNR of T2WI were 241.10, 94.01, 56.90, the SNR of T1WI were 805.22, 234.71, 156.88; the SNR of T2WI were 94.01, 71.57, 51.40 when slice thickness/interval were 4.0 mm/0.5 mm, 3.0 mm/0.3 mm, 2.0 mm/0.2 mm respectively with FOV 10 cm×10 cm, matrix 288×224, NEX 2; the SNR of T1WI was 223.34, 183.80, 130.43 with thickness/interval 3.2 mm/0 mm, 2.8 mm/0 mm, 2.4 mm/0 mm. The SNR of FSPGR images was 263.69, 95.40, and 67.35 when FOV were 18 cm×18 cm, 10 cm×10 cm, and 8 cm×8 cm. The SNR of FSPGR images were 95.40, 93.44, 67.39, when thickness/interval were 3.2 mm/0 mm, 2.8 mm/0 mm, 2.4 mm/0 mm with FOV 10 cm×10 cm, matrix 288×224, NEX 2. (2) For the 10 healthy volunteers, the SNR of T2WI was 166.22±45.17, 65.17±4.99, the CNR was 142.09±43.58, 54.98±5.48 when FOV was 18 cm×18 cm and 10 cm×10 cm with eye surface coil. The SNR was 70.53±6.58, 9.79±0.87, the CNR was 57.20±2.58, 6.35±0.34 when FOV was 18 cm×18 cm and 10 cm×10 cm with head coil, the SNR of T2WI with eye surface coil were 2.36 times (P<0.01) and 6.66 times (P<0.01) than with head coil, the CNR were 2.48 times (P<0.01), 8.66 times (P<0.01) when FOV 18 cm×18 cm and 10 cm×10 cm, there was no significant difference between the SNR of T2WI with eye surface coil and FOV 10 cm×10 cm and T2WI with head coil and 18 cm×18 cm (P>0.05), but the spatial resolution of the images with eye surface coil (0.45mm) was higher than thatof the head coil (0.8 mm).Conclusion: The recommended MRI protocol for eyeball were FSE sequence, slice thickness 4.0 mm/0.5 mm, matrix 288×224, NEX 2, FOV 10 cm×10 cm for eye surface coil and 18 cm×18 cm for head coil.
[Keywords] Eye；Magnetic resonance imaging；Quality control

CHEN Qing-hua Department of Medical Imaging Center, Beijing Tongren Hospital, Capital Medical University, Beijing 100730, China

WANG Zhen-chang * Department of Medical Imaging Center, Beijing Tongren Hospital, Capital Medical University, Beijing 100730, China

XIAN Jun-fang Department of Medical Imaging Center, Beijing Tongren Hospital, Capital Medical University, Beijing 100730, China

*Correspondence to: Wang ZC, E-mail: cjr.wzhch@vip.163.com

Conflicts of interest   None.

Received  2012-07-20
Accepted  2012-08-20
DOI: 10.3969/j.issn.1674-8034.2012.05.002
DOI:10.3969/j.issn.1674-8034.2012.05.002.

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