Journal of Neuro-Oncology

, Volume 78, Issue 2, pp 145–151

PET Imaging of cerebral astrocytoma with 13N-ammonia

  • Zhang Xiangsong
  • Liang Changhong
  • Chen Weian
  • Zhou Dong
Clinical–patient studies

DOI: 10.1007/s11060-005-9069-x

Cite this article as:
Xiangsong, Z., Changhong, L., Weian, C. et al. J Neurooncol (2006) 78: 145. doi:10.1007/s11060-005-9069-x

Summary

 

We performed this study in order to assess the clinical potential of 13N-ammonia PET in patients with cerebral astrocytoma.

Methods

Dynamic 13N-ammonia PET was performed in 25 patients with suspected cerebral gliomas or recurrent cerebral astrocytomas (19 male and 6 female patients; age range 18–64 years) detected by MRI. The histopathological diagnoses were made for all cases either by biopsy or craniotomy, except for one patient with brain infarction and one patient with brain radiation necrosis confirmed by repeated MRI imaging. PET images were visually inspected, and the tumor-to-white matter count (T/W) ratios and the perfusion index (PI) of the tumors were determined.

Results

Six out of nine cases of low-grade gliomas were detected with 13N-ammonia PET, and three non-astrocytoma low-grade gliomas were not detected with 13N-ammonia PET. All 11 high-grade astrocytomas exhibited markedly increased uptake of 13N-ammonia. The five non-neoplastic lesions exhibited low uptake, low T/W ratios and low PI. The significant differences were observed between high-grade and low-grade gliomas with respect to both the T/W ratios and PI (T/W ratios: 5.92±2.27, n=11 vs. 1.66±0.61, n=9, P<0.01; PI: 5.22±1.67, n=11 vs. 1.60±0.54, n=9, P<0.01). There were the significant differences between the T/W ratios and PI in low-grade astrocytomas and that in non-neoplastic lesions (T/W ratios: 2.00±0.42, n=6 vs. 0.97±0.11, n=5, P<0.01; PI: 1.89±0.37, n=6 vs. 0.99±0.03, n=5, P<0.01).

Conclusions

There is a substantial uptake of 13N-ammonia in cerebral astrocytomas. 13N-ammonia PET may enable differentiation between low- and high-grade astrocytomas, and has the potential to enable differentiation between low-grade astrocytomas and non-neoplastic lesions.

Keywords

astrocytomaammonianitrogen radioisotopesPET

Copyright information

© Springer Science+Business Media, Inc. 2006

Authors and Affiliations

  • Zhang Xiangsong
    • 1
    • 2
    • 5
  • Liang Changhong
    • 3
  • Chen Weian
    • 1
  • Zhou Dong
    • 4
  1. 1.Department of Nuclear Medicine, The First Affiliated HospitalSun Yat-sen UniversityGuangzhouChina
  2. 2.Department of Nuclear MedicineGuangdong Provincial People’s HospitalGuangzhouChina
  3. 3.Department of RadiologyGuangdong Provincial People’s HospitalGuangzhouChina
  4. 4.Department of NeurosurgeryGuangdong Provincial People’s HospitalGuangzhouChina
  5. 5.Department of Nuclear Medicine, The First Affiliated HospitalSun Yat-sen UniversityGuangzhouChina