B. Movsas et al., Quantifying radiation therapy-induced brain injury with whole-brain protonMR spectroscopy: Initial observations, RADIOLOGY, 221(2), 2001, pp. 327-331
Citations number
43
Categorie Soggetti
Radiology ,Nuclear Medicine & Imaging","Medical Research Diagnosis & Treatment
PURPOSE: To quantify the extent of neuronal cell loss imparted to the brain
by means of radiation therapy through the decline of the amino acid deriva
tive N-acetylaspartate (NAA) by using proton (hydrogen 1) magnetic resonanc
e (MR) spectroscopy.
MATERIALS AND METHODS: Proton MR spectroscopy in a clinical MR imager was u
sed to ascertain the amount of whole-brain NAA before and immediately after
whole-brain radiation therapy 3-4 weeks later. Eight patients (four women,
four men; median age, 55 years; age range, 39-70 years) were studied. All
subjects had lung cancer (non-small cell lung cancer [n = 5] small-cell lun
g cancer [n = 3]) and, received either palliative or prophylactic whole-bra
in radiation therapy. Six of them also underwent a Mini-Mental Status Exami
nation (MMSE) for correlation with th whole-brain NAA. Two-tailed Student t
tests were used to evaluate the data.
RESULTS: A significant (P =.042) average decline in whole-brain NAA of -0.9
1 mmol per person was observed in the cohort. No corresponding changes occu
rred in MMSE scores. There was no significant difference in whole-brain NAA
decline between prophylactic and therapeutic whole-brain radiation therapy
.
CONCLUSION: Since whole-brain NAA loss was detected even when MMSE scores w
ere unchanged, the former seems to be a more sensitive measure of radiation
therapy injury than is the latter.