PMID- 30989596
OWN - NLM
STAT- MEDLINE
DCOM- 20191206
LR  - 20191217
IS  - 1879-5447 (Electronic)
IS  - 0158-9938 (Linking)
VI  - 42
IP  - 2
DP  - 2019 Jun
TI  - Quantitative analysis of effects of the grid specifications on the quality of 
      digital radiography images.
PG  - 553-561
LID - 10.1007/s13246-019-00756-3 [doi]
AB  - A grid is one of the key components of a digital radiography (DR) system because 
      it removes scattered radiation, which arises when X-rays penetrate an object and 
      improves diagnostic accuracy by enhancing image quality. With the widespread use 
      of DR systems, demand for grids with high precision has simultaneously increased. 
      Because unsuitable grids may decrease image quality and lead to misdiagnosis, 
      using optimised grids for DR systems is critical. In this study, we aimed to 
      analyse the quality of X-ray images acquired using grids with different 
      specifications and proposed standardised criteria for grid use on the basis of 
      our results. We measured modulation transfer function (MTF), normalised noise 
      power spectrum (NNPS) and detective quantum efficiency (DQE) using grids with 
      different ratios (10:1, 12:1 and 15:1) with or without implementing poly methyl 
      methacrylate (PMMA) phantoms (0-20 cm). Pixel pitch of the detector used in this 
      experiment was 143 mum. Based on this, a grid with a line frequency of 85 line 
      pairs/cm was selected to prevent distortion caused by implementing unoptimised 
      grids. As a result, the NNPS was found to increase when using the grid, and the 
      difference in MTF and DQE was only measured when the scattered X-ray was 
      generated by stacking the PMMA phantom. However, grids showed a positive effect 
      MTF and DQE when the PMMA phantom was implemented. Specifically, MTF and DQE 
      improved with increase in grid ratio. Thus, it is desirable to use a high-ratio 
      grid to improve image quality.
FAU - Lee, Sanghyun
AU  - Lee S
AD  - R&D, JPI Healthcare, Co., Ltd., 43, Seonggok-ro 22beon-gil, Ansan-si, Republic of 
      Korea. leesh@jpi.co.kr.
FAU - Chung, Woohyun
AU  - Chung W
AD  - R&D, JPI Healthcare, Co., Ltd., 43, Seonggok-ro 22beon-gil, Ansan-si, Republic of 
      Korea.
LA  - eng
PT  - Journal Article
DEP - 20190415
PL  - Netherlands
TA  - Australas Phys Eng Sci Med
JT  - Australasian physical & engineering sciences in medicine
JID - 8208130
RN  - 9011-14-7 (Polymethyl Methacrylate)
SB  - IM
MH  - Algorithms
MH  - Phantoms, Imaging
MH  - Polymethyl Methacrylate/chemistry
MH  - Radiographic Image Enhancement/*standards
OTO - NOTNLM
OT  - Detective quantum efficiency
OT  - Digital radiography
OT  - Grid
OT  - Grid ratio
OT  - Modulation transfer function
OT  - Normalised noise power spectrum
EDAT- 2019/04/17 06:00
MHDA- 2019/12/18 06:00
CRDT- 2019/04/17 06:00
PHST- 2018/08/19 00:00 [received]
PHST- 2019/04/02 00:00 [accepted]
PHST- 2019/04/17 06:00 [pubmed]
PHST- 2019/12/18 06:00 [medline]
PHST- 2019/04/17 06:00 [entrez]
AID - 10.1007/s13246-019-00756-3 [pii]
AID - 10.1007/s13246-019-00756-3 [doi]
PST - ppublish
SO  - Australas Phys Eng Sci Med. 2019 Jun;42(2):553-561. doi: 
      10.1007/s13246-019-00756-3. Epub 2019 Apr 15.