title: Detection of prostate cancer local recurrence following radical prostatectomy: assessment using a continuously acquired radial golden-angle compressed sensing acquisition.
abstract: To compare image quality and diagnostic performance for detecting local recurrence (LR) of prostate cancer after radical prostatectomy (RP) between standard dynamic contrast-enhanced (DCE) magnetic resonance imaging (MRI) and a high spatiotemporal resolution, continuously acquired Golden-angle RAdial Sparse Parallel acquisition employing compressed sensing reconstruction ("GRASP").
  
  
  
  A search was conducted for prostate MRI examinations performed in patients with PSA ≥0.2 ng/mL after RP in whom follow-up evaluation allowed classification as positive (≥50% PSA reduction after pelvic radiation or positive biopsy) or negative (<50% PSA reduction after pelvic radiation; spontaneous PSA normalization) for LR, yielding 13 patients with standard DCE (11 LR+) and 12 with GRASP (10 LR+). Standard DCE had voxel size 3.0 × 1.9 × 1.9 mm and temporal resolution 5.5 s. GRASP had voxel size 1.0 × 1.1 × 1.1 cm and was retrospectively reconstructed at 2.3 s resolution. Two radiologists evaluated DCE sequences for image quality measures (1-5 scale) and the presence of LR.
  
  
  
  GRASP achieved higher scores than standard DCE from both readers (p < 0.001-0.136) for anatomic clarity (R1: 4.4 ± 0.8 vs. 2.8 ± 0.67 R2: 4.8 ± 0.5 vs. 3.2 ± 0.6), sharpness (3.6 ± 0.9 vs. 2.5 ± 0.7; 4.6 ± 0.5 vs. 2.6 ± 0.5), confidence in interpretation (3.8 ± 0.8 vs. 3.1 ± 0.9; 3.8 ± 1.0 vs. 3.1 ± 1.2), and conspicuity of detected lesions (4.7 ± 0.5 vs. 3.8 ± 1.1; 4.5 ± 0.5 vs. 3.8 ± 1.0). For detecting LR, GRASP also achieved higher sensitivity (70% vs. 36%; 80% vs. 45%), specificity (R1 and R2: 100% vs. 50%), and accuracy (75% vs. 38%; 83% vs. 46%) for both readers.
  
  
  
  Although requiring larger studies, high spatiotemporal resolution GRASP achieved substantially better image quality and diagnostic performance than standard DCE for detecting LR in patients with elevated PSA after prostatectomy.
authors: Department of Radiology, NYU School of Medicine, NYU Langone Medical Center, 660 First Avenue, Third Floor, New York, 10016, NY, USA. Andrew.Rosenkrantz@nyumc.org.
authors: Andrew B
authors: AB
authors: Rosenkrantz
authors: Department of Radiology, NYU School of Medicine, NYU Langone Medical Center, 660 First Avenue, Third Floor, New York, 10016, NY, USA.
authors: Anunita
authors: A
authors: Khasgiwala
authors: Department of Radiology, NYU School of Medicine, NYU Langone Medical Center, 660 First Avenue, Third Floor, New York, 10016, NY, USA.
authors: Ankur M
authors: AM
authors: Doshi
authors: Department of Radiology, NYU School of Medicine, NYU Langone Medical Center, 660 First Avenue, Third Floor, New York, 10016, NY, USA.
authors: Justin M
authors: JM
authors: Ream
authors: Department of Urologic Oncology, NYU School of Medicine, NYU Langone Medical Center, 660 First Avenue, Third Floor, New York, 10016, NY, USA.
authors: Samir S
authors: SS
authors: Taneja
authors: Department of Urologic Oncology, NYU School of Medicine, NYU Langone Medical Center, 660 First Avenue, Third Floor, New York, 10016, NY, USA.
authors: Herbert
authors: H
authors: Lepor
mesh_terms: D000368:Aged; D000369:Aged, 80 and over; D003287:Contrast Media; D006801:Humans; D007090:Image Interpretation, Computer-Assisted; D008279:Magnetic Resonance Imaging / Q000379:methods*; D008297:Male; D008875:Middle Aged; D009364:Neoplasm Recurrence, Local / Q000000981:diagnostic imaging* / Q000473:pathology*; D011468:Prostatectomy / Q000379:methods*; D011471:Prostatic Neoplasms / Q000000981:diagnostic imaging* / Q000473:pathology* / Q000601:surgery*; D012189:Retrospective Studies
chemical_list: D003287:Contrast Media
keywords: Biochemical recurrence; Dynamic contrast-enhanced imaging; MRI; Prostate cancer; Radical prostatectomy