The dataset contains multispectral images and PPG data from 45 subjects who underwent an occlusion protocol to induce changes in blood perfusion in the dominant hand. All the partipiants signed an informed consent. Blood perfusion Blood perfusion refers to the passage of oxygen and other nutrients through the circulatory system. We look to provide data for the evaluation of non-invasive approaches based on multi-spectral images. PPG reference data from the thumb is provided for validation purposes. Occlusion Protocol The occlusion protocol for each participant lasts around 10 minutes. The participants were seated, and their superior limbs were extended on a table. An automatic blood pressure monitor measured their systolic and diastolic pressures. A blood cuff was placed in their dominant arm, and a PPG sensor MAX30102 (Maxim Integrated, CA, United States) was placed in their thumb finger. A multispectral camera was positioned above to record the hand palm throughout the protocol. The camera employed is a CMS-V1-C-EVR1M-USB3 (SILIOS Technologies SA., France), which records 9 multispectral channels in the VNIR region of the spectrum. . The protocol is divided into 5 stages, each one lasts 2 minutes. Start: No pressure is applied Vascular Occlusion: a fixed pressure of 60 mmHg is applied through the blood cuff Rest: The pressure is liberated Total Occlusion: A pressure equal to the initial systolic pressure plus 20 mmHg is constantly applied. Hyperemia: The pressure is released. Data available: The multispectral datasets for each subject are contained in a P#.7z file. Single-channel images are included. The name of each file specifies the participant ID, the time (minutes_seconds_milliseconds) of the acquisition with respect to the start of the occlusion protocol, the multispectral dataset, and the corresponding multispectral channel. Example: the following file name specifies a file for participant number 21. The data was captured at 9 minutes and 59.5290 seconds after the start of the occlusion protocol. The image corresponds to the first channel (the count starts at 0). P21_09_59_5290_d02459_channel0.png The PPG data is stored in a simple csv file with txt extension for each participant. It contains the Red and Infrared channel data as well as the acquisition time of each sample. The PPG data for all the participants are contained in the compressed file PPG.7z. Reference multispectral images for calibration are also provided in the file Calibration.7z. This file contains multispectral images with the cap on (Dark_Reference) plus three folders with reference images taken during the same session as the participants. reference_set_A: = P1 to P10 reference_set_B: = P11 to P30 reference_set_C: = P31 to P45 each folder contains multispectral images of different white reference materials which can be employed for different calibration methods: WhiteA = white tile WhiteB = white reference bar WhiteP = sheet of white paper WhiteT = Teflon (PTFE) sheets The participant’s data is summarized in the next table. ID Age Gender Skin type Systolic Pressure # Multi-spectral Datasets P1 20 M 4 109 2,456 P2 20 M 3 129 2,458 P3 22 M 4 117 2,460 P4 19 F 3 110 2,454 P5 18 F 4 106 2,458 P6 18 F 4 111 2,471 P7 18 F 4 91 2,462 P8 18 F 4 102 2,474 P9 21 M 3 113 2,468 P10 19 F 3 108 2,461 P11 18 M 4 137 2,461 P12 18 F 3 132 2,457 P13 18 M 4 119 2,461 P14 18 F 4 100 2,460 P15 18 F 3 104 2,460 P16 18 M 3 126 2,462 P17* 18 F 3 105 2,469 P18 21 F 4 122 2,461 P19 21 F 3 130 2,462 P20 21 F 3 106 2,457 P21 23 M 3 133 2,459 P22 23 M 3 134 2,471 P23 21 F 3 115 2,472 P24 21 M 3 111 2,445 P25 21 M 3 116 2,460 P26 21 M 4 107 2,462 P27 21 F 4 106 2,460 P28 24 F 4 106 2,460 P29 22 M 4 125 2,460 P30 21 M 4 125 2,461 P31 21 F 3 100 2,472 P32 22 M 3 120 2,460 P33 21 M 4 127 2,461 P34 19 F 3 100 2,457 P35 19 F 3 108 2,460 P36 20 F 3 136 2,471 P37 19 M 4 129 2,457 P38* 19 M 3 128 2,463 P39* 18 M 3 111 2,479 P40 23 M 4 110 2,462 P41 21 M 3 130 2,465 P42 20 F 3 126 2,461 P43 22 F 3 125 2,459 P44 22 M 3 138 2,467 P45 22 M 4 104 2,461 Table 1.- Participant's ID and relevant information.Participants with an * presented a lot of movement during the recording.

Data formats MSI: png files PPG: csv files with txt extension