# ImagingAtlas image sources

Source and license pages checked 13 October 2026. These are real publicly shared teaching images, not AI-generated scans. Every comparison uses independent examples, not matched scans of one patient. Files are downloaded unchanged; display scaling in the browser does not alter the files. These image licenses are separate from the website code license. No endorsement by image creators is implied.

CT images here are fixed PNG/JPEG displays without calibrated Hounsfield-unit data. Do not relabel brightness adjustment of these files as true CT windowing.

## Attribution

### Chest radiograph — `assets/chest-xray.jpg`

Frontal chest radiograph showing the lungs, cardiac silhouette and ribs. The source identifies this as a normal digitally acquired chest radiograph.

- Creator: Ptrump16
- Source: https://commons.wikimedia.org/wiki/File:Chest_x-ray_plain_film_normal.jpg
- License: [CC BY-SA 4.0](https://creativecommons.org/licenses/by-sa/4.0/)
- Original file: https://upload.wikimedia.org/wikipedia/commons/1/1f/Chest_x-ray_plain_film_normal.jpg
- Changes: none.

### Chest CT in a lung window — `assets/chest-ct.jpg`

An axial chest CT displayed in a lung window, showing branching pulmonary vessels against air-filled lungs. This is a fixed display image, not raw CT data; it cannot support true Hounsfield-unit windowing.

- Creator: Ptrump16
- Source: https://commons.wikimedia.org/wiki/File:CT-Thorax-5.0-B70f-Lungs.jpg
- License: [CC BY-SA 4.0](https://creativecommons.org/licenses/by-sa/4.0/)
- Original file: https://upload.wikimedia.org/wikipedia/commons/4/4e/CT-Thorax-5.0-B70f-Lungs.jpg
- Changes: none.

### Noncontrast head CT — `assets/brain-ct.png`

Axial noncontrast head CT with a sagittal locator, from a source series described as normal. Dense skull and darker brain tissue illustrate CT attenuation differences.

- Creator: Mikael Häggström
- Source: https://commons.wikimedia.org/wiki/File:CT_of_a_normal_brain%2C_axial_16.png
- License: [CC0 1.0](https://creativecommons.org/publicdomain/zero/1.0/)
- Original file: https://upload.wikimedia.org/wikipedia/commons/1/1c/CT_of_a_normal_brain%2C_axial_16.png
- Changes: none.

### T1-weighted brain MRI — `assets/brain-t1.jpg`

Axial T1-weighted brain MRI acquired at 7 Tesla. This independent example shows dark ventricular fluid and gray–white matter contrast; it is not paired with the T2 example.

- Creator: Asnaebsa
- Source: https://commons.wikimedia.org/wiki/File:MRI_of_Human_Brain.jpg
- License: [CC BY-SA 4.0](https://creativecommons.org/licenses/by-sa/4.0/)
- Original file: https://upload.wikimedia.org/wikipedia/commons/b/b2/MRI_of_Human_Brain.jpg
- Changes: none.

### T2-weighted brain MRI — `assets/brain-t2.jpg`

Axial T2-weighted brain MRI at the lateral ventricles. Ventricular fluid is bright. This is a different source study and slice level from the T1 example.

- Creator: Novaksean; source crop by Mikael Häggström
- Source: https://commons.wikimedia.org/wiki/File:Normal_axial_T2-weighted_MR_image_of_the_brain.jpg
- License: [CC BY-SA 4.0](https://creativecommons.org/licenses/by-sa/4.0/)
- Original file: https://upload.wikimedia.org/wikipedia/commons/b/b7/Normal_axial_T2-weighted_MR_image_of_the_brain.jpg
- Changes: none.

### Renal cyst on CT — `assets/kidney-ct.png`

Axial abdominal CT with a left renal cortical cyst identified by the source. This is a pathology example, not a normal counterpart to the ultrasound image.

- Creator: Cerevisae
- Source: https://commons.wikimedia.org/wiki/File:Axial_CT_scan_of_left_renal_cortical_cyst.png
- License: [CC BY-SA 4.0](https://creativecommons.org/licenses/by-sa/4.0/)
- Original file: https://upload.wikimedia.org/wikipedia/commons/c/c4/Axial_CT_scan_of_left_renal_cortical_cyst.png
- Changes: none.

### Longitudinal renal ultrasound — `assets/kidney-ultrasound.jpg`

Normal adult kidney on ultrasound. Original source labels: * column of Bertin, ** pyramid, *** cortex, **** sinus; the dashed line measures renal length.

- Creator: Kristoffer Lindskov Hansen, Michael Bachmann Nielsen and Caroline Ewertsen
- Source: https://commons.wikimedia.org/wiki/File:Normal_adult_kidney.jpg
- License: [CC BY 4.0](https://creativecommons.org/licenses/by/4.0/)
- Original file: https://upload.wikimedia.org/wikipedia/commons/a/a2/Normal_adult_kidney.jpg
- Changes: none.

## Original publication for renal ultrasound

Hansen KL, Nielsen MB, Ewertsen C. *Ultrasonography of the Kidney: A Pictorial Review*. Diagnostics. 2016;6(1):2. https://doi.org/10.3390/diagnostics6010002. Licensed CC BY 4.0.

## Review limits

Source descriptions provide study context. Visual and embedded metadata inspection is used to check for visible names, dates of birth and patient record numbers; this does not establish independent clinical validation. The source for the normal brain CT explicitly states written consent for online publication. Other consent status is not independently established by this atlas.

Visual inspection of all seven downloaded images found no visible patient names, dates of birth or patient record numbers. Embedded EXIF/XMP fields inspected did not reveal these identifiers. Original anatomical labels, measurement marks and orientation letters remain intact.