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Low field strength magnetic resonance imaging of bone marrow in acute leukaemia
M A Richards1, J A Webb, S Malik
1ICRF Department of Medical Oncology, St. Bartholomew's Hospital, London, U.K.
Abstract:
The accuracy of low field strength (0.08 Tesla) magnetic resonance imaging (MRI) of bone marrow for the detection of acute leukaemia in adults has been assessed by comparison with bone marrow biopsy results. Spin lattice relaxation time (T1) measurements from patients were compared with those from 90 volunteers. Eighteen patients were studied at the time of diagnosis of leukaemia. Bone marrow T1 was prolonged in all cases. One of two patients with refractory anaemia with excess of blasts in transformation (RAEBt) had prolonged bone marrow T1, the other had normal T1. T1 at the time of diagnosis for patients with acute leukaemia or RAEBt correlated with the cellularity and blast cell count in the marrow. None of the 17 patients who were studied when in long-term remission of leukaemia had prolonged marrow T1. Serial studies were undertaken in five of the newly diagnosed patients. An increase in bone marrow T1 was observed in each of four patients studied seven days after the start of treatment, at a time when they showed a decrease in leukaemic cells on peripheral blood examination. T1 measurements made 3 weeks after the commencement of chemotherapy were similar to pretreatment values and did not reflect the reduction in leukaemic infiltration observed on bone marrow needle aspirate. The implications and possible explanations for these findings are discussed.
Insights
Low field strength magnetic resonance imaging (MRI) accurately detects acute leukaemia by measuring prolonged bone marrow spin lattice relaxation time (T1). This technique shows potential for monitoring treatment response in leukaemia patients.
Area of Science:
- Biomedical Imaging
- Hematology
- Oncology
Background:
- Accurate detection of acute leukaemia is crucial for timely treatment.
- Bone marrow biopsy is the standard diagnostic method.
- Magnetic Resonance Imaging (MRI) offers a non-invasive imaging alternative.
Purpose of the Study:
- To assess the accuracy of low field strength (0.08 Tesla) MRI for detecting acute leukaemia in adult bone marrow.
- To evaluate the correlation of spin lattice relaxation time (T1) measurements with leukaemia diagnosis and treatment status.
Main Methods:
- Comparison of low field strength MRI T1 measurements in bone marrow of 18 acute leukaemia patients with 90 healthy volunteers.
- Analysis of T1 values at diagnosis, during remission, and serially during treatment.
- Correlation of T1 measurements with bone marrow cellularity and blast cell counts.
Main Results:
- Bone marrow T1 was prolonged in all 18 acute leukaemia patients at diagnosis.
- Prolonged T1 correlated with marrow cellularity and blast cell count.
- T1 normalized in patients in long-term remission; transiently increased during early treatment, but did not reflect later treatment response.
Conclusions:
- Low field strength MRI T1 measurements show high accuracy in detecting acute leukaemia at diagnosis.
- T1 measurements may reflect early treatment effects but are less reliable for assessing long-term treatment response.
- This imaging technique shows promise as a non-invasive tool for leukaemia diagnosis and potentially early treatment monitoring.