Evidence map›Paper›PMID 32348982›Full record

ArticleRespiration; international review of thoracic diseases

Dynamic-Ventilatory Digital Radiography in Air Flow Limitation: A Change in Lung Area Reflects Air Trapping.

Noriyuki Ohkura, Kazuo Kasahara, Satoshi Watanabe, Johsuke Hara, Miki Abo, Takashi Sone, Hideharu Kimura, Munehisa Takata, Masaya Tamura, Isao Matsumoto and 3 more

Open access · hybridAbstract read
In one paragraph

Article in Respiration; international review of thoracic diseases. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 25 papers.

0numbers the graph read from it
0cells of the map it votes in
25citing papers in PubMed
2.4field-weighted citation impact, top 9% of its field
1 · What the graph read from it

What it found

Each row is one number read from the abstract, on the scale the paper reported it, with its interval. Left of the dashed line favours the treatment, right favours the comparator. Under each row is the sentence it came from. New to these charts? A ten-minute tutorial.

The abstract states no effect estimate the extractor could read, or names no intervention and outcome on the map, so this paper lights no cell and moves no belief. It is still indexed, cited and linked below.

2 · The registry

The trial behind it

Trials whose registry record cites this paper, or whose number appears in the abstract. A trial that started after this paper was published is citing it as background, not reporting it.

Neither the registry nor the abstract names a trial number. If this is a trial report, that itself is worth knowing.

3 · Its place in the literature

Who cites it

25 citing papers in PubMed, 35 citations in OpenAlex.

  1. Review
  2. Article
  3. Article
  4. Deep learning-based lung volume estimation with dynamic chest radiography.Journal of applied clinical medical physics · 2026
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4 · The record

Corrections and comments

PubMed lists nothing against this paper. Absence here is not a guarantee, only a check that was made.

5 · Who and what money

Authors and funding

13 authors at 3 institutions in 1 country.

Noriyuki OhkuraDepartment of Respiratory Medicine, Kanazawa University Hospital, Kanazawa, Japan, n-ohkura@med.kanazawa-u.ac.jp.
Kazuo KasaharaDepartment of Respiratory Medicine, Kanazawa University Hospital, Kanazawa, Japan.
Satoshi WatanabeDepartment of Respiratory Medicine, Kanazawa University Hospital, Kanazawa, Japan.
Johsuke HaraDepartment of Respiratory Medicine, Kanazawa University Hospital, Kanazawa, Japan.
Miki AboDepartment of Respiratory Medicine, Kanazawa University Hospital, Kanazawa, Japan.
Takashi SoneDepartment of Respiratory Medicine, Kanazawa University Hospital, Kanazawa, Japan.
Hideharu KimuraDepartment of Respiratory Medicine, Kanazawa University Hospital, Kanazawa, Japan.
Munehisa TakataDepartment of Thoracic, Cardiovascular, and General Surgery, Kanazawa University Hospital, Kanazawa, Japan.
Masaya TamuraDepartment of Thoracic, Cardiovascular, and General Surgery, Kanazawa University Hospital, Kanazawa, Japan.
Isao MatsumotoDepartment of Thoracic, Cardiovascular, and General Surgery, Kanazawa University Hospital, Kanazawa, Japan.
Yusuke NakadeClinical Laboratory, Kanazawa University Hospital, Kanazawa, Japan.
Shigeru SanadaFaculty of Health Sciences, Komatsu University, Komatsu, Japan.
Rie TanakaCollege of Medical, Pharmaceutical, and Health Sciences, Kanazawa University, Kanazawa, Japan.
Kanazawa University Hospital · JPKanazawa University · JPKomatsu University · JP

Funding

No grant is acknowledged in the PubMed record.

6 · The paper itself

Abstract

objectiveThe aim of this study was to determine the utility of dynamic-ventilatory digital radiography (DR) for pulmonary function assessment in patients with airflow limitation.

methodsOne hundred and eighteen patients with airflow limitation (72 patients with lung cancer before surgery, 35 patients with chronic obstructive pulmonary disease [COPD], 6 patients with asthma, and 5 patients with asthma-COPD overlap syndrome) were assessed with dynamic-ventilatory DR. The patients were instructed to inhale and exhale slowly and maximally. Sequential chest X-ray images were captured in 15 frames per second using a dynamic flat-panel imaging system. The relationship between the lung area and the rate of change in the lung area due to respiratory motion with respect to pulmonary function was analyzed.

resultsThe rate of change in the lung area from maximum inspiration to maximum expiration (Rs ratio) was associated with the RV/TLC ratio (r = 0.48, p < 0.01) and the percentage of the predicted FEV1 (r = -0.33, p < 0.01) in patients with airflow limitations. The Rs ratio also decreased in an FEV1-dependent manner.

conclusionThe rate of change in the lung area due to respiratory motion evaluated with dynamic DR reflects air trapping. Dynamic DR is a potential tool for the comprehensive assessment of pulmonary function in patients with COPD.

Indexed as

AgedAsthmaAsthma-Chronic Obstructive Pulmonary Disease Overlap SyndromeFemaleForced Expiratory VolumeFunctional Residual CapacityHumansLung NeoplasmsMaleMiddle AgedPulmonary Disease, Chronic ObstructiveRadiographic Image EnhancementRadiography, ThoracicVital CapacityAir flow limitationChronic obstructive pulmonary diseaseDigital radiographyLung area changesPulmonary function

Identifiers

PMID32348982
PMCPMC7845443
OpenAlexW3017493903

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Registered trials

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Read under generation 80e0d062 · epoch 390. Bibliography from PubMed, PubMed Central and OpenAlex; grants from NIH RePORTER; trial links from ClinicalTrials.gov; estimates, votes and beliefs from the OpenQuestion graph.