Evidence map›Paper›PMID 34021364›Full record

ArticleSkeletal radiology2021

Correlation between Hounsfield unit derived from head, thorax, abdomen, spine and pelvis CT and t-scores from DXA.

Mohamad Farhan Mohamad Amin, Wan Mezlina Wan Zakaria, Noorazrul Yahya

Abstract read
PubMed Publisher
In one paragraph

Article in Skeletal radiology, 2021. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 27 papers, 3 of them syntheses that pooled it.

0numbers the graph read from it
0cells of the map it votes in
27citing papers in PubMed, 3 pooled it
4.3field-weighted citation impact, top 5% 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

27 citing papers in PubMed, 3 syntheses or guidelines pooled it, 35 citations in OpenAlex.

  1. CT Hounsfield Unit Measurements Around the Hip and Their Utility for Opportunistic Screening: A Systematic Review.Journal of the American Academy of Orthopaedic Surgeons. Global research & reviews · 2026
    Pooled it
  2. Pooled it
  3. Pooled it
  4. Article
  5. Article
  6. Can Hounsfield Unit Evaluation of Preoperative CT Scans Predict Surgeon's Preference of Cementless Fixation in Total Knee Arthroplasty?Journal of orthopaedic research : official publication of the Orthopaedic Research Society · 2025
    Article
  7. Article
  8. Article
  9. Article
  10. Article
  11. Article
  12. Article
  13. Article
  14. Article
  15. Article
  16. Article
  17. Article
  18. Article
  19. Article
  20. Article
4 · The record

Corrections and comments

5 · Who and what money

Authors and funding

3 authors at 2 institutions in 1 country.

Mohamad Farhan Mohamad AminRadiology Department, Hospital Putrajaya, Precint 7, 62000, Putrajaya, Malaysia.
Wan Mezlina Wan ZakariaRadiology Department, Hospital Putrajaya, Precint 7, 62000, Putrajaya, Malaysia.
Noorazrul YahyaDiagnostic Imaging and Radiotherapy, Faculty of Health Sciences, National University of Malaysia, Jalan Raja Muda Aziz, 50300, Kuala Lumpur, Malaysia. noorazrul.yahya@ukm.edu.my.
National University of Malaysia · MYTengku Ampuan Rahimah Hospital · MY

Funding

No grant is acknowledged in the PubMed record.

6 · The paper itself

Abstract

objectivesCT examination can potentially be utilised for early detection of bone density changes with no additional procedure and radiation dose. We hypothesise that the Hounsfield unit (HU) measured from CT images is correlated to the t-scores derived from dual energy X-ray absorptiometry (DXA) in multiple anatomic regions. MATERIALS &

methodsData were obtained retrospectively from all patients who underwent both CT examinations - brain (frontal bone), thorax (T7), abdomen (L3), spine (T7 & L3) or pelvis (left hip) - and DXA between 2014 and 2018 in our centre. To ensure comparability, the period between CT and DXA studies must not exceed one year. Correlations between HU values and t-scores were calculated using Pearson's correlation. Receiver operating characteristic (ROC) curves were generated, and the area under the curve (AUC) was used to determine threshold HU values for predicting osteoporosis.

resultsThe inclusion criteria were met by 1043 CT examinations (136 head, 537 thorax, 159 lumbar and 151 left hip). The left hip consistently provided the most robust correlations (r = 0.664-0.708, p < 0.001) and the best AUC (0.875-0.893). Meanwhile, thorax T7 and lumbar L3 showed average correlations (range of r values is 0.497-0.679, p < 0.001, AUC range = 0.680-0.783, 95% CI 0.561-0.922, all p < 0.02) and moderate AUC (0.680-0.783). Frontal bone shows low correlation and weak AUC with r < 0.5, AUC = 0.538-0.655, all p > 0.05.

conclusionHU values derived from the hip, T7 and L3 provided a good to moderate correlation to t-scores with a good prediction for osteoporosis. The suggested optimal thresholds may be used in clinical settings after external validations are performed.

Indexed as

Bone DensityLumbar VertebraeAbdomenAbsorptiometry, PhotonHumansPelvisRetrospective StudiesThoraxTomography, X-Ray ComputedBone mineral densityComputed tomographyDual energy X-ray absorptiometryHounsfield unitOsteoporosis

Identifiers

PMID34021364
OpenAlexW3162838253

What OpenQuestion holds

Textmetadata
Read underepoch 390

Registered trials

None linked

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.