This　paper　describes　a　promising　route　for　the　exploration　and　development　of　3.0　THz　sensing　and　imaging　with　FET-based　power　detectors　in　a　standard　65　nm　CMOS　process.　Based　on　the　plasma-wave　theory　proposed　by　Dyakonov　and　Shur,　we　designed　high-responsivity　and　low-noise　multiple　detectors　for　monitoring　a　pulse-mode　3.0　THz　quantum　cascade　laser　(QCL).　Furthermore,　we　present　a　fully　integrated　high-speed　32　x　32-pixel　3.0　THz　CMOS　image　sensor　(CIS).　The　full　CIS　measures　2.81　x　5.39　mm(2)　and　achieves　a　423　V/W　responsivity　(Rv)　and　a　5.3　nW　integral　noise　equivalent　power　(NEP)　at　room　temperature.　In　experiments,　we　demonstrate　a　testing　speed　reaching　319　fps　under　continuous-wave　(CW)　illumination　of　a　3.0　THz　QCL.　The　results　indicate　that　our　terahertz　CIS　has　excellent　potential　in　cost-effective　and　commercial　THz　imaging　and　material　detection.