Whole-body diffusion-weighted imaging with apparent diffusion coefficient mapping for treatment response assessment in patients with diffuse large B-cell lymphoma: pilot study.

Abstract:

OBJECTIVES:The aim of this pilot study was to assess post-treatment apparent diffusion coefficient (ADC) changes of diffuse large B-cell lymphoma lesions on respiratory-gated whole-body diffusion-weighted imaging (DWI), with integrated (18)F-fluoro-2-deoxyglucose positron emission tomography/computed tomography (PET/CT) as the reference standard. MATERIALS AND METHODS:A total of 15 patients underwent both whole-body DWI (b = 50, 400, 800 s/mm(2)) and PET/CT before initiation and after 4 cycles of chemotherapy. ADC of residual masses (lymph node and organ lesions) was assessed both visually and quantitatively, including measurement of mean ADC (ADC).(Figure is included in full-text article.) RESULTS:After chemotherapy, among 85 examined lymph node regions, residual nodes were present in 62 (73%) regions on DWI. Of these 62 regions, 26 had persistent lymph nodes with longest transverse diameter >10 mm, ie, positive based on DWI size criteria. The mean ADC of these 26 regions increased from 0.658 × 10(-3) ± 0.153 mm(2)/s (standard deviation) at baseline to 1.501 × 10(-3) ± 0.307 mm(2)/s (paired t test, P < 0.0001). Only 6 of these 26 regions were considered positive on PET/CT. Combining visual ADC analysis to size criteria reduced the number of false-positive results of DWI from 20 to 2 regions. For organ involvement, ADC values also increased compared with baseline (1.558 × 10(-3) ± 0.424 mm(2)/s vs. 0.675 × 10(-3) ± 0.135 mm(2)/s, respectively; P = 0.0009). CONCLUSIONS:Whole-body DWI with ADC mapping can show a significant increase in ADC values of residual masses persisting after treatment and may help to assess the treatment response in patients with diffuse large B-cell lymphoma.

journal_name

Invest Radiol

journal_title

Investigative radiology

authors

Lin C,Itti E,Luciani A,Zegai B,Lin SJ,Kuhnowski F,Pigneur F,Gaillard I,Paone G,Meignan M,Haioun C,Rahmouni A

doi

10.1097/RLI.0b013e3182087b03

subject

Has Abstract

pub_date

2011-05-01 00:00:00

pages

341-9

issue

5

eissn

0020-9996

issn

1536-0210

journal_volume

46

pub_type

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