Baseline drift vector of multiple points on body surface using a near-infrared camera

概要

඲ᩥせ⣙
Baseline drift vector of multiple points on body
surface using a near-infrared camera
㸦㏆㉥እ⥺࣓࢝ࣛ࡟ࡼࡿయ⾲㠃」ᩘⅬࡢ࣮࣋ࢫࣛ࢖
ࣥࢻࣜࣇࢺ࣋ࢡࢺࣝἲࡢ㛤Ⓨ㸧 
Physical and Engineering Sciences in Medicine,
45(1):143–155;2022.
୺ᣦᑟᩍဨ㸸Ọ⏣ 㟹ᩍᤵ
㸦་⣔⛉Ꮫ◊✲⛉ ᨺᑕ⥺⭘⒆Ꮫ㸧
๪ᣦᑟᩍဨ㸸⢖஭ ࿴ኵᩍᤵ
㸦་⣔⛉Ꮫ◊✲⛉ ᨺᑕ⥺デ᩿Ꮫ㸧
๪ᣦᑟᩍဨ㸸ᮧୖ ♸ྖ෸ᩍᤵ
㸦་⣔⛉Ꮫ◊✲⛉ ᨺᑕ⥺⭘⒆Ꮫ㸧

኱ᶫ  ཌஅ
㸦་ṑ⸆ಖ೺Ꮫ◊✲⛉ ་ṑ⸆Ꮫᑓᨷ㸧

1. ᗎㄽ

⌧௦ࡢᨺᑕ⥺἞⒪࡛ࡣࠊ⭘⒆ࡔࡅ࡟༑ศ࡞⥺㔞ࢆᢞ୚ࡍࡿ࡜ྠ᫬࡟㏆ഐࡢṇᖖ⮚ჾࡀཷࡅࡿ
⥺㔞ࢆపࡃᢚ࠼ࡿᢏ⾡ࡀ㛤Ⓨࡉࢀࠊ㧗⢭ᗘ໬ࡀ᥎㐍ࡉࢀ࡚ࡁࡓࠋ≉࡟⫵ࡸ⫢⮚࡞࡝ࡢྍື⮚ჾ࡟
㧗⥺㔞ࢆᢞ୚ࡍࡿయᖿ㒊ᐃ఩ᨺᑕ⥺἞⒪࡛ࡣࠊ࿧྾㐠ື࡟క࠺⭘⒆ࡢືࡁࢆィ ࡍࡿࡓࡵ࡟ࠊ
ᵝࠎ࡞ཎ⌮࡟ᇶ࡙ࡃ࿧྾㐠ື┘どࢩࢫࢸ࣒ࡀ㛤Ⓨࡉࢀ࡚ࡁࡓࠋ౛࠼ࡤࠊ⭘⒆㏆ഐ࡟ᇙࡵ㎸ࡲࢀࡓ
࣐࣮࣮࢝ࢆ X ⥺㏱ど࡛┘どࡍࡿࢩࢫࢸ࣒ࡣࠊ⭘⒆㏆ഐࡢືࡁࢆ┤᥋┘どࡍࡿࡓࡵ఩⨨⢭ᗘࡀ㧗
࠸࡜࠸࠺฼Ⅼࡀ࠶ࡿ୍᪉࡛ࠊ⿕ࡤࡃ⥺㔞ࡢቑຍࡀၥ㢟࡜࡞ࡿࠋࡑࡢ௚࡟ࠊ㉥እ⥺ࢭࣥࢧ࣮ࢆ⏝࠸
࡚య⾲㠃ࢆ㠀౵くⓗ࡟┘どࡍࡿᵝࠎ࡞ࢩࢫࢸ࣒ࡀ㛤Ⓨࡉࢀ࡚ࡁࡓࠋලయⓗ࡟ࡣࠊ㉥እ⥺ࢭࣥࢧ࣮
࠿ࡽࡢ㊥㞳ࢆィ ࡍࡿࢩࢫࢸ࣒ࡸࠊ」ᩘࡢ㉥እ⥺࣓࢝ࣛࢆ⏝࠸࡚య⾲㠃ᙧ≧ࢆ┘どࡍࡿࢩࢫࢸ
࣒ࡀᣲࡆࡽࢀࡿࡀࠊ࠸ࡎࢀࡶయ⾲㠃ࡢ≉ᐃࡢⅬࡢ㏣㊧ࢆࡋ࡚࠸࡞࠸ࠋࡲࡓࠊయ⾲㠃ࡢ఩⨨ࡣࠊ⭘
⒆ࡢ࿧྾ᛶ⛣ື࡟ࡼࡿࡶࡢ࡜➽⫗ࡢᘱ⦆ࡸ◳┤࡟ࡼࡿ࣮࣋ࢫࣛ࢖ࣥࢻࣜࣇࢺ࡟ࡼࡿࡶࡢࡀ࠶ࡿ
ࡓࡵࠊ᪤Ꮡࡢࢩࢫࢸ࣒ࡼࡾࡶヲ⣽࡞ࢹ࣮ࢱࢆྲྀᚓ࡛ࡁࡿࢩࢫࢸ࣒ࡢ㛤Ⓨࡀᚲせ࡛࠶ࡿ࡜⪃࠼ࡽ
ࢀࡿࠋࡑࡇ࡛ᮏ◊✲࡛ࡣࠊయ⾲㠃ࡢ」ᩘⅬࢆ 3 ḟඖⓗ࡟㏣㊧ࡍࡿࡇ࡜࡛ࠊ≉࡟࣮࣋ࢫࣛ࢖ࣥࢻࣜ
ࣇࢺࡢືࡁࢆ 3 ḟඖⓗ࡟┘どࡍࡿࡇ࡜ࡀྍ⬟࡞ࢩࢫࢸ࣒ࢆ㛤Ⓨࡋࡓࠋయ⾲㠃ୖࡢྛⅬࡢ࣮࣋ࢫ
ࣛ࢖ࣥࢻࣜࣇࢺࢆ 3 ḟඖ࣋ࢡࢺࣝ࡜ࡋ࡚ᢳฟࡋࠊ
ࡑࡢ㔜せᛶࢆ♧ࡍࡇ࡜ࢆᮏ◊✲ࡢ┠ⓗ࡜ࡋࡓࠋ
2. ᪉ἲ
ᡃࠎࡀ㛤Ⓨࡋࡓࢩࢫࢸ࣒ (Body Surface Tracker, BST) ࡣࠊ㏆㉥እ⥺࣓࢝ࣛ (Kinect V2) ࡜ࠊ
୍⯡ⓗ࡟㈍኎ࡉࢀ࡚࠸ࡿ㟷Ⰽࡢ෇ᙧࢩ࣮ࣝ (┤ᚄ 2 cm) ࢆ࣐࣮࣮࢝࡜ࡋ࡚ㄆ㆑ࡍࡿࢯࣇࢺ࢙࢘
࢔ (Marker Tracker) ࡛ᵓᡂࡉࢀ࡚࠸ࡿࠋయ⾲㠃࡟㈞௜ࡉࢀࡓ᭱኱ 30 ಶࡢ࣐࣮࣮࢝ࡢືࡁࢆ㏆
㉥እ⥺࣓࡛࢝ࣛ㏣㊧ࡍࡿࡇ࡜࡟ࡼࡾࠊྛ࣐࣮࣮࢝ࡢ 3 ḟඖᗙᶆࢆྲྀᚓࡋࠊ࣮࣋ࢫࣛ࢖ࣥࢻࣜࣇ
ࢺ࣋ࢡࢺࣝ (baseline drift vector, BDV) ࢆ⟬ฟࡍࡿࡇ࡜ࡀྍ⬟࡛࠶ࡿࠋ
ࡣࡌࡵ࡟ࠊືࡃ࣐࣮࣮࢝࡟ᑐࡍࡿ BST ࡢᇶᮏᛶ⬟ࢆホ౯ࡋࡓࠋ᣺ᖜ࡜࿘ᮇࡀタᐃྍ⬟࡞ື
ែࣇ࢓ࣥࢺ࣒࡟ࢩ࣮ࣝࢆ㈞௜ࡋࠊ᣺ᖜࢆ 15mm ࡛ᅛᐃࡋࡓୖ࡛࿘ᮇࢆኚ໬ࡉࡏࡿࡇ࡜࡛ࠊࢩ࣮
ࣝࡢ㐠ື᳨ฟ⬟ຊࢆ᳨ドࡋࡓࠋḟ࡟ࠊ8 ேࡢ೺ᗣ࡞࣎ࣛࣥࢸ࢕࢔ࡢయ⾲㠃࡟ 30 ಶࡢࢩ࣮ࣝࢆ㈞
௜ࡋࠊ30 ศ㛫ࢩ࣮ࣝࡢ㏣㊧ࢆ⾜࠸ࠊ3 ḟඖᗙᶆࢆྲྀᚓࡍࡿࡇ࡜࡛ࠊBDV ࢆᐜ᫆࡟⟬ฟࡍࡿᡭἲ
ࢆ㛤Ⓨࡋࡓࠋࡓࡔࡋࠊ࣎ࣛࣥࢸ࢕࢔᳨࡛ドࢆ⾜࠺๓࡟ࠊࢩ࣮ࣝࡢ㈞௜㡿ᇦࡣࠊ⬚㦵㒊ࠊ⫘㦵㒊ࠊ
⭡㒊ࡢ 3 㡿ᇦ࡟ศ㢮ࡋࠊࡑࢀࡒࢀࡢ㒊఩࡟ 3 ಶࠊ12 ಶࠊ15 ಶࡢࢩ࣮ࣝࢆ㈞௜ࡋࡓࠋBDV ࡢྛ
ᗙᶆᡂศࡢ 1 ศ㛫࠶ࡓࡾࡢ⛣ື㔞ࡀタᐃࡋࡓチᐜ⠊ᅖ (1 mm ࡲࡓࡣ 2 mm) ࢆ㉸࠼ࡿ㢖ᗘࡢ
ゎᯒࠊ2 ࡘࡢࢩ࣮ࣝῧ௜㡿ᇦ㛫ࡢ BDV ┦㛵㛵ಀࡢゎᯒࠊ⫘㦵ࡢ 1 ࡘ࡟╔┠ࡋ 3 ḟඖⓗ࡞య⾲㠃
ࢩ࣮ࣝࡢືࡁࡢྍど໬ࢆ⾜ࡗࡓࠋ

3. ⤖ᯝ࡜⪃ᐹ

ࣇ࢓ࣥࢺ࣒ࢆ⏝࠸ࡓືࡃ࣐࣮࣮࢝࡟ᑐࡍࡿ᳨ドࡢ⤖ᯝࠊ఩⨨ศゎ⬟ࡣࢩ࣮ࣝࡢ㏿ᗘ࡟౫Ꮡࡏ
ࡎࠊᶆ‽೫ᕪࡀ 0.52 mm ࡛࠶ࡗࡓࠋࡇࡢ⤖ᯝࢆඖ࡟ࠊࢩ࣮ࣝࡢ㏿ᗘࠊ࿘ᮇࡢほⅬ࠿ࡽ఩⨨ศゎ
⬟ࢆ᳨ウࡋࠊே࡟ࢩ࣮ࣝࢆ㈞௜ࡋࡓሙྜࡶ㏣㊧ྍ⬟࡛࠶ࡿ࡜ุ᩿ࡋࡓࠋḟ࡟ࠊ8 ேࡢ࣎ࣛࣥࢸ࢕
࢔࡛ BDV ࢆィ ࡋࡓ⤖ᯝࠊయ⾲㠃ࡢ 3 ḟඖⓗ࡞ BDV ࡀᏑᅾࡍࡿࡇ࡜ࢆ☜ㄆࡋࡓࠋBDV ࡢ୰࡟
ࡣ᫬㛫࡜ඹ࡟ኚ໬ࡋ࡚࠸ࡃ㐜࠸ BDV ࡸ▷᫬㛫࡟㢖Ⓨࡍࡿ BDV ࡢᏑᅾࡀ☜ㄆ࡛ࡁࡓࠋࡇࡢࡇ࡜
࠿ࡽࠊBDV ࡣ࣎ࣛࣥࢸ࢕࢔࡟ࡼࡿពᅗⓗ࡞ືࡁ (యໃࡢ⑂ࢀ࡞࡝) ࡸ࿧྾㐠ື࡞࡝ࡢ」ᩘࡢせ
ᅉࢆྵࢇ࡛࠸ࡿྍ⬟ᛶࡀ♧၀ࡉࢀࡓࠋࡲࡓࠊ1 ศ㛫࠶ࡓࡾࡢ⛣ື㔞ࡀタᐃࡋࡓチᐜ⠊ᅖ (1 mm
࡜ 2 mm) ࢆ㉸࠼ࡿ㢖ᗘࡣࠊࡑࢀࡒࢀ 30㸣 ࡜ 15㸣 ࡛࠶ࡗࡓࠋࡑࡢࡓࡵࠊ἞⒪ィ⏬ࡢࡓࡵࡢ
CT ᧜ᙳࡢࡼ࠺࡞ࠊࢃࡎ࠿࡞᫬㛫࡛࠶ࡗ࡚ࡶ BDV ࡬ࡢ⪃៖ࡣ㔜せ࡛࠶ࡿ࡜⪃࠼ࡿࠋࡉࡽ࡟ࠊ2 ࡘ
ࡢࢩ࣮ࣝ㈞௜㡿ᇦ㛫ࡢ BDV ┦㛵㛵ಀ࡟ࡘ࠸࡚ࡶ᳨ドࡋࡓ⤖ᯝࠊࡑࢀࡒࢀࡢ㡿ᇦࡀྠᵝࡢືࡁࢆ
ࡋࡓሙྜࠊࡶࡋࡃࡣ␗࡞ࡿືࡁࢆࡋࡓሙྜ࡟ศูࡍࡿࡇ࡜࡛㡿ᇦ඲యࡢ୪㐍㐠ື࡜࿧྾㐠ື࡜
ࢆ༊ู࡛ࡁࡿྍ⬟ᛶࡀ♧၀ࡉࢀࡓࠋࡇࢀࡀ᫂☜࡟༊ู࡛ࡁࡿࡼ࠺࡟࡞ࢀࡤࠊ1 ࡘࡢືࡁ࡟ᑐࡋ࡚
⏕⌮Ꮫⓗ࡞ືࡁ࡛࠶ࡿ࠿ព㆑ⓗ࡞ືࡁ࡛࠶ࡿ࠿ࢆุู࡛ࡁࠊᵝࠎ࡞ືࡁ࡟ᑐࡍࡿᑐฎࡀྍ⬟࡟
࡞ࡿ࡜⪃࠼ࡿࠋ᭱ᚋ࡟ࠊ⫘㦵ࡢ 1 ࡘ࡟╔┠ࡋ 3 ḟඖⓗ࡞య⾲㠃ࢩ࣮ࣝࡢືࡁࢆྍど໬ࡍࡿࡇ࡜
࡟ᡂຌࡋࡓࠋࡇࢀ࡟ࡼࡗ࡚┤ឤⓗ࡟㈞௜ࢩ࣮ࣝࡢືࡁࢆᢕᥱࡍࡿࡇ࡜ࡀྍ⬟࡜࡞ࡾࠊ㢌ᑿ᪉ྥࡢ
࣮࣋ࢫࣛ࢖ࣥࢻࣜࣇࢺࡢືࡁ☜ㄆࡍࡿࡇ࡜ࡀ࡛ࡁࡓࠋ
4. ⤖ㄽ
㠀౵くⓗ࡞㏆㉥እ⥺࣓࢝ࣛࢆ౑⏝ࡋ࡚య⾲㠃ୖࡢ」ᩘⅬࡢ 3 ḟඖ㏣㊧ࢩࢫࢸ࣒ࢆపࢥࢫࢺ࡛
ᵓ⠏ࡋࠊ࣮࣋ࢫࣛ࢖ࣥࢻࣜࣇࢺࢆィ ࡍࡿ᪉ἲࢆ☜❧ࡋࡓࠋࡲࡓࠊᮏ◊✲ࡢゎᯒ࡟ࡼࡾ㢌ᑿ᪉ྥ
ࡢ࣮࣋ࢫࣛ࢖ࣥࢻࣜࣇࢺࡢᏑᅾࡀ᫂ࡽ࠿࡜࡞ࡗࡓࠋࡇࢀࡽࡢࡇ࡜࠿ࡽࠊయ⾲㠃ࡢ 3 ḟඖⓗ࡞㏣
㊧ࡣࠊᨺᑕ⥺἞⒪ࡢ⢭ᗘྥୖ࡟࠾࠸࡚ࡶ㔜せ࡞せ⣲࡛࠶ࡿ࡜⪃࠼ࡿࠋ