Usefulness of advanced monoenergetic reconstruction technique in dual-energy computed tomography for detecting bladder cancer

Purpose Detecting bladder cancer (BC) in routine CT images is important but is sometimes difficult when cancer is small. We evaluated the ability of 40-keV advanced monoenergetic images to depict BC. Materials and methods Fifty-two patients with a median age of 74 years (range 45–92) who were diagno...

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Bibliographic Details
Published in:Japanese journal of radiology 2022-02, Vol.40 (2), p.177-183
Main Authors: Nakagawa, Motoo, Naiki, Taku, Naiki-Ito, Aya, Ozawa, Yoshiyuki, Shimohira, Masashi, Ohnishi, Masahiro, Shibamoto, Yuta
Format: Article
Language:English
Subjects:
Aged
Aged, 80 and over
Bladder
Bladder cancer
Cancer
Computed tomography
Evaluation
Humans
Image contrast
Image enhancement
Image reconstruction
Imaging
Mathematical analysis
Medical imaging
Medicine
Medicine & Public Health
Middle Aged
Nuclear Medicine
Original
Original Article
Radiographic Image Interpretation, Computer-Assisted
Radiography, Dual-Energy Scanned Projection
Radiology
Radiotherapy
Retrospective Studies
Signal-To-Noise Ratio
Tomography, X-Ray Computed
Urinary Bladder Neoplasms - diagnostic imaging
Urinary Bladder Neoplasms - surgery
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Summary:Purpose Detecting bladder cancer (BC) in routine CT images is important but is sometimes difficult when cancer is small. We evaluated the ability of 40-keV advanced monoenergetic images to depict BC. Materials and methods Fifty-two patients with a median age of 74 years (range 45–92) who were diagnosed as BC with transurethral resection or cystectomy, were included. They were examined with contrast-enhanced dual-energy CT (DE-CT) and advanced virtual monoenergetic images (40 keV) were reconstructed. For evaluating depictability of BC on 40-keV or virtual-120-kVp images, the difference in CT number between the cancer and bladder wall (BC–BW value) were calculated. We also subjectively assessed depictability of BC in virtual-120-kVp and 40-keV images using a 4-grade Likert scale (3: clear, 0: not visualized). Results In 42 of 52 patients, BC–BW values could be calculated because BC was detected on CT images. The mean BC–BW value at 40 keV was significantly higher than that of virtual 120 kVp [80.5 ± 54 (SD) vs. 11.4 ± 12.5 HU, P  
ISSN:1867-1071
1867-108X
DOI:10.1007/s11604-021-01195-5