Abstract
Objectives
To test the hypothesis that an accelerated, T1-weighted 3D CAIPIRINHA SPACE sequence with isotropic voxel size offers a similar performance to conventional T1-weighted 2D TSE (turbo spin echo) for the evaluation of bone tumor extent and characteristics.
Methods
Thirty-four patients who underwent 3-T MRI with 3DT1 (CAIPIRINHA SPACE TSE) and 2DT1 (TSE) were included. Sequence acquisition time was reported. Two radiologists independently evaluated each technique for tumor location, size/length, tumor-to-joint distance, signal intensity, margin/extraosseous extension, and signal-to-noise (SNR) and contrast-to-noise (CNR) ratios.
Results
Tumors were located in long (20/36, 55.5%) and pelvic (16/36, 44.4%) bones. 3DT1 sequence required an average acquisition time of 235 s (± 42 s, range 156–372), while two plane 2DT1 sequences combined (coronal and axial) had an average acquisition time of 381 s (± 73 s, range 312–523). There was no difference in the measurements of tumor length and tumor-to-joint distance (p = 0.95) between 3DT1 and 2DT1 images. Tumors were hypointense (17/36, 47.2% vs 17/36, 47.2%), isointense (12/36, 33.3% vs 12/36, 33.3%), or hyperintense (7/36, 19.4% vs 7/36, 19.4%) on 3DT1 vs 2DT1, respectively. Assessment of tumor margins and extraosseous extension was similar, and there was no difference in tumor SNR or CNR (p > 0.05).
Conclusions
An accelerated 3D CAIPIRINHA SPACE T1 sequence provides comparable assessments of intramedullary bone tumor extent and similar tumor characteristics to conventional 2DT1 MRI. For the assessment of bone tumors, the isotropic volume acquisition and multiplanar reformation capability of the 3DT1 datasets can obviate the need for 2DT1 acquisitions in multiple planes.
Key Points
• 3DT1 offers an equivalent performance to 2DT1 for the assessment of bone tumor characteristics, with faster and higher resolution capability, obviating the need for acquiring 2DT1 in multiple planes.
• There was no difference in the measurements of tumor length and tumor-to-joint distance obtained on 3DT1 and 2DT1 images.
• There was no difference in signal-to-noise ratio (SNR) or contrast-to-noise ratio (CNR) measures between 3DT1 and 2DT1.
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Abbreviations
- 3D:
-
Three dimensional
- 2D:
-
Two dimensional
- CAIPIRINHA:
-
Controlled Aliasing in Parallel Imaging Results in Higher Acceleration
- CNR:
-
Contrast-to-noise ratio
- FOV:
-
Field of view
- FSE:
-
Fast spin echo
- GRAPPA:
-
Generalized Autocalibrating Partial Parallel Acquisition
- IW:
-
Intermediate weighted
- MRI:
-
Magnetic resonance imaging
- PACS:
-
Picture archiving and communication system
- PD:
-
Proton density
- ROI:
-
Region of interest
- SD:
-
Standard deviation
- SI:
-
Signal intensity
- SNR:
-
Signal-to-noise ratio
- SPACE:
-
Sampling perfection with application-optimized contrasts using different flip angle evolution
- TE:
-
Echo time
- TR:
-
Repetition time
- TSE:
-
Turbo spin echo
- VIBE:
-
Volume intercalated breath-hold exam
- W:
-
Weighted
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The scientific guarantor of this publication is Laura Fayad.
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Luna, R., Fritz, J., del Grande, F. et al. Determination of skeletal tumor extent: is an isotropic T1-weighted 3D sequence adequate?. Eur Radiol 31, 3138–3146 (2021). https://doi.org/10.1007/s00330-020-07394-4
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DOI: https://doi.org/10.1007/s00330-020-07394-4